/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */

/* Document
   ========================================================================== */

/**
 * 1. Correct the line height in all browsers.
 * 2. Prevent adjustments of font size after orientation changes in iOS.
 */

 html {
    line-height: 1.15; /* 1 */
    -webkit-text-size-adjust: 100%; /* 2 */
  }
  
  /* Sections
     ========================================================================== */
  
  /**
   * Remove the margin in all browsers.
   */
  
  body {
    margin: 0;
  }
  
  /**
   * Render the `main` element consistently in IE.
   */
  
  main {
    display: block;
  }
  
  /**
   * Correct the font size and margin on `h1` elements within `section` and
   * `article` contexts in Chrome, Firefox, and Safari.
   */
  
  h1 {
    font-size: 2em;
    margin: 0.67em 0;
  }
  
  /* Grouping content
     ========================================================================== */
  
  /**
   * 1. Add the correct box sizing in Firefox.
   * 2. Show the overflow in Edge and IE.
   */
  
  hr {
    box-sizing: content-box; /* 1 */
    height: 0; /* 1 */
    overflow: visible; /* 2 */
  }
  
  /**
   * 1. Correct the inheritance and scaling of font size in all browsers.
   * 2. Correct the odd `em` font sizing in all browsers.
   */
  
  pre {
    font-family: monospace, monospace; /* 1 */
    font-size: 1em; /* 2 */
  }
  
  /* Text-level semantics
     ========================================================================== */
  
  /**
   * Remove the gray background on active links in IE 10.
   */
  
  a {
    background-color: transparent;
  }
  
  /**
   * 1. Remove the bottom border in Chrome 57-
   * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
   */
  
  abbr[title] {
    border-bottom: none; /* 1 */
    text-decoration: underline; /* 2 */
    text-decoration: underline dotted; /* 2 */
  }
  
  /**
   * Add the correct font weight in Chrome, Edge, and Safari.
   */
  
  b,
  strong {
    font-weight: bolder;
  }
  
  /**
   * 1. Correct the inheritance and scaling of font size in all browsers.
   * 2. Correct the odd `em` font sizing in all browsers.
   */
  
  code,
  kbd,
  samp {
    font-family: monospace, monospace; /* 1 */
    font-size: 1em; /* 2 */
  }
  
  /**
   * Add the correct font size in all browsers.
   */
  
  small {
    font-size: 80%;
  }
  
  /**
   * Prevent `sub` and `sup` elements from affecting the line height in
   * all browsers.
   */
  
  sub,
  sup {
    font-size: 75%;
    line-height: 0;
    position: relative;
    vertical-align: baseline;
  }
  
  sub {
    bottom: -0.25em;
  }
  
  sup {
    top: -0.5em;
  }
  
  /* Embedded content
     ========================================================================== */
  
  /**
   * Remove the border on images inside links in IE 10.
   */
  
  img {
    border-style: none;
  }
  
  /* Forms
     ========================================================================== */
  
  /**
   * 1. Change the font styles in all browsers.
   * 2. Remove the margin in Firefox and Safari.
   */
  
  button,
  input,
  optgroup,
  select,
  textarea {
    font-family: inherit; /* 1 */
    font-size: 100%; /* 1 */
    line-height: 1.15; /* 1 */
    margin: 0; /* 2 */
  }
  
  /**
   * Show the overflow in IE.
   * 1. Show the overflow in Edge.
   */
  
  button,
  input { /* 1 */
    overflow: visible;
  }
  
  /**
   * Remove the inheritance of text transform in Edge, Firefox, and IE.
   * 1. Remove the inheritance of text transform in Firefox.
   */
  
  button,
  select { /* 1 */
    text-transform: none;
  }
  
  /**
   * Correct the inability to style clickable types in iOS and Safari.
   */
  
  button,
  [type="button"],
  [type="reset"],
  [type="submit"] {
    -webkit-appearance: button;
  }
  
  /**
   * Remove the inner border and padding in Firefox.
   */
  
  button::-moz-focus-inner,
  [type="button"]::-moz-focus-inner,
  [type="reset"]::-moz-focus-inner,
  [type="submit"]::-moz-focus-inner {
    border-style: none;
    padding: 0;
  }
  
  /**
   * Restore the focus styles unset by the previous rule.
   */
  
  button:-moz-focusring,
  [type="button"]:-moz-focusring,
  [type="reset"]:-moz-focusring,
  [type="submit"]:-moz-focusring {
    outline: 1px dotted ButtonText;
  }
  
  /**
   * Correct the padding in Firefox.
   */
  
  fieldset {
    padding: 0.35em 0.75em 0.625em;
  }
  
  /**
   * 1. Correct the text wrapping in Edge and IE.
   * 2. Correct the color inheritance from `fieldset` elements in IE.
   * 3. Remove the padding so developers are not caught out when they zero out
   *    `fieldset` elements in all browsers.
   */
  
  legend {
    box-sizing: border-box; /* 1 */
    color: inherit; /* 2 */
    display: table; /* 1 */
    max-width: 100%; /* 1 */
    padding: 0; /* 3 */
    white-space: normal; /* 1 */
  }
  
  /**
   * Add the correct vertical alignment in Chrome, Firefox, and Opera.
   */
  
  progress {
    vertical-align: baseline;
  }
  
  /**
   * Remove the default vertical scrollbar in IE 10+.
   */
  
  textarea {
    overflow: auto;
  }
  
  /**
   * 1. Add the correct box sizing in IE 10.
   * 2. Remove the padding in IE 10.
   */
  
  [type="checkbox"],
  [type="radio"] {
    box-sizing: border-box; /* 1 */
    padding: 0; /* 2 */
  }
  
  /**
   * Correct the cursor style of increment and decrement buttons in Chrome.
   */
  
  [type="number"]::-webkit-inner-spin-button,
  [type="number"]::-webkit-outer-spin-button {
    height: auto;
  }
  
  /**
   * 1. Correct the odd appearance in Chrome and Safari.
   * 2. Correct the outline style in Safari.
   */
  
  [type="search"] {
    -webkit-appearance: textfield; /* 1 */
    outline-offset: -2px; /* 2 */
  }
  
  /**
   * Remove the inner padding in Chrome and Safari on macOS.
   */
  
  [type="search"]::-webkit-search-decoration {
    -webkit-appearance: none;
  }
  
  /**
   * 1. Correct the inability to style clickable types in iOS and Safari.
   * 2. Change font properties to `inherit` in Safari.
   */
  
  ::-webkit-file-upload-button {
    -webkit-appearance: button; /* 1 */
    font: inherit; /* 2 */
  }
  
  /* Interactive
     ========================================================================== */
  
  /*
   * Add the correct display in Edge, IE 10+, and Firefox.
   */
  
  details {
    display: block;
  }
  
  /*
   * Add the correct display in all browsers.
   */
  
  summary {
    display: list-item;
  }
  
  /* Misc
     ========================================================================== */
  
  /**
   * Add the correct display in IE 10+.
   */
  
  template {
    display: none;
  }
  
  /**
   * Add the correct display in IE 10.
   */
  
  [hidden] {
    display: none;
  }












body, html {
    margin: auto;
    font-family: 'Noto Sans', sans-serif;
}

h1 {
    font-size: 2.5rem;
}

header {
    display: flex;
    justify-content: center;
}

main {
    display: flex;
    justify-content: center;
    flex-direction: column;
    background-color: grey;
    border: solid black 1px;
    width: 30rem !important;
    margin: 0 auto;
    max-height: 100%;
}

main div#calculator-display {
    box-sizing: border-box;
    width: 90%;
    text-align: right;
    font-size: 3.5rem;
    line-height: 0.6rem;
    background-color: whitesmoke;
    border: 1px solid black;
    margin: 10px auto;
    padding-left: 5px;
    padding-right: 5px;
    overflow: hidden;
    
}

main div.button-grid {
    margin: 0 auto;
    width: 95%;
    padding-bottom: 10px;
    padding-top: 5px;
    display: grid;
    grid-template-columns: 25% 25% 25% 25%;
    grid-template-rows: auto;
    grid-template-areas: 
    "ac ac del divide"
    "one two three multiply"
    "four five six add"
    "seven eight nine subtract"
    "period zero equals equals";
}

main div.button-grid button.btn {
    font-size: 2rem;
}

main div.button-grid button.btn:hover {
    background-color: #c4c4c4;
}

main div.button-grid button.btn:focus {
    outline: 0;
    box-shadow: none !important;
}

#button_AC {
    grid-area: ac;
}

#button_DEL {
    grid-area: del;
}

#button_DIVIDE {
    grid-area: divide;
}

#button_1 {
    grid-area: one;
}

#button_2 {
    grid-area: two;
}

#button_3 {
    grid-area: three;
}

#button_TIMES {
    grid-area: multiply;
}

#button_4 {
    grid-area: four;
}

#button_5 {
    grid-area: five;
}

#button_6 {
    grid-area: six;
}

#button_PLUS {
    grid-area: add;
}

#button_7 {
    grid-area: seven;
}

#button_8 {
    grid-area: eight;
}

#button_9 {
    grid-area: nine;
}

#button_MINUS {
    grid-area: subtract;
}

#button_PERIOD {
    grid-area: period;
}

#button_0 {
    grid-area: zero;
}

#button_EQUALS {
    grid-area: equals;
}

@media only screen and (max-width: 500px) {
    
    h1 {
        font-size: 1.5rem;
        word-wrap: wrap;
    }

    header {
        display: flex;
        justify-content: center;
    }

    main {
        display: flex;
        justify-content: center;
        flex-direction: column;
        background-color: grey;
        border: solid black 1px;
        width: 18rem !important;
        margin: 0 auto;
        max-height: 100%;
    }

    main div#calculator-display {
        box-sizing: border-box;
        width: 90%;
        text-align: right;
        font-size: 1.5rem;
        line-height: 0.6rem;
        background-color: whitesmoke;
        border: 1px solid black;
        margin: 10px auto;
        padding-left: 5px;
        padding-right: 5px;
        overflow: hidden;
    }

    main div.button-grid {
        margin: 0 auto;
        width: 95%;
        padding-bottom: 10px;
        padding-top: 5px;
        display: grid;
        grid-template-columns: 25% 25% 25% 25%;
        grid-template-rows: auto;
        grid-template-areas: 
        "ac ac del divide"
        "one two three multiply"
        "four five six add"
        "seven eight nine subtract"
        "period zero equals equals";
    }

    main div.button-grid button.btn {
        font-size: 1rem;
    }

    main div.button-grid button.btn:hover {
        background-color: #c4c4c4;
    }

    main div.button-grid button.btn:focus {
        outline: 0;
        box-shadow: none !important;
    }

    #button_AC {
        grid-area: ac;
    }

    #button_DEL {
        grid-area: del;
    }

    #button_DIVIDE {
        grid-area: divide;
    }

    #button_1 {
        grid-area: one;
    }

    #button_2 {
        grid-area: two;
    }

    #button_3 {
        grid-area: three;
    }

    #button_TIMES {
        grid-area: multiply;
    }

    #button_4 {
        grid-area: four;
    }

    #button_5 {
        grid-area: five;
    }

    #button_6 {
        grid-area: six;
    }

    #button_PLUS {
        grid-area: add;
    }

    #button_7 {
        grid-area: seven;
    }

    #button_8 {
        grid-area: eight;
    }

    #button_9 {
        grid-area: nine;
    }

    #button_MINUS {
        grid-area: subtract;
    }

    #button_PERIOD {
        grid-area: period;
    }

    #button_0 {
        grid-area: zero;
    }

    #button_EQUALS {
        grid-area: equals;
    }
}