style.css

body {
    font-family: "Agency FB", serif;
    background-color: lightgrey;
}

#main-container {
    display: grid;
    display: -ms-grid;
    grid-template-rows: 70px 270px auto;
    -ms-grid-rows: 70px 270px auto;
    grid-template-columns: 200px 1fr 220px;
    -ms-grid-columns: 200px 1fr 220px;
}

#score-div {
    font-size: 2em;
    text-align: center;
    grid-column: 1 / 4;
    grid-row: 1;
    -ms-grid-column: 1;
    -ms-grid-column-span: 4;
    -ms-grid-row: 1;
}

#game-table {
    margin: 0 auto;
    /*border: solid dimgray;*/
    -webkit-box-shadow: 5px 10px 76px 1px rgba(0, 0, 0, 0.8);
    -moz-box-shadow: 5px 10px 76px 1px rgba(0, 0, 0, 0.8);
    box-shadow: 5px 10px 76px 1px rgba(0, 0, 0, 0.8);
    padding: 0;
}

#game-table-container {
    grid-column: 2;
    grid-row: 2;
    -ms-grid-column: 2;
    -ms-grid-row: 2;
    display: block;
}

#main-container table td {
    height: 100px;
    width: 100px;
    max-width: 100px;
    max-height: 100px;
    margin: 10px;
    border-radius: 1px;

    color: black;
    font-size: 3em;
    text-align: center;
}

#left-column > label {
    color: darkslategray;
    font-size: 1em;
}

.keyboard-key {
    display: inline-block;
    border: solid 1px;
    border-radius: 5%;
    width: 30px;
    height: 30px;
    text-align: center;
    vertical-align: middle;
    font-weight: 900;
    background-color: #888888;
}

.description {
    margin-bottom: 10px;
}

.keyboard-key-container {
    display: flex;
    justify-content: center;
}

#settings {
    display: grid;
    grid-template: auto / 1fr 1fr;

    /*display: -ms-grid;*/
    -ms-grid-rows: auto;
    -ms-grid-columns: 1fr 1fr;;
    grid-column-gap: 5px;

    align-items: center;
    justify-content: center;
    margin-top: 10px;
}

.settings-option {
    grid-column: 1;
    -ms-grid-column: 1;
    font-size: 25px;
    font-weight: bold;
    justify-self: end;
}

.settings-value {
    grid-column: 2;
    -ms-grid-column: 2;
}

.settings-button {
    grid-row: 3;
    grid-column: 1 / 3;

    -ms-grid-row: 3;
    -ms-grid-column: 1;
    -ms-grid-column-span: 3;

    justify-self: center;
}

#rows-settings > select {
    color: darkgreen;
    background-color: transparent;
    font-size: 1em;
}

#columns-settings > select {
    color: darkgreen;
    background-color: transparent;
    font-size: 1em;
}

#top-scores {
    grid-column: 3;
    grid-row: 2;

    -ms-grid-column: 3;
    -ms-grid-row: 2;
}

#top-scores > .heading {
    color: darkred;
    font-size: 2em;
    margin-bottom: 10px;
    text-align: center;
}

#no-scores {
    text-align: center;
    font-size: 3em;
    display: none;
}

.score-row {
    font-size: 1em;
    display: grid;
    grid-template: auto / 15px auto 60px;

    display: -ms-grid;
    -ms-grid-rows: auto;
    -ms-grid-columns: 15px auto 60px;
}

.score-row > .score-row-id {
    color: green;
    justify-self: left;
    grid-column: 1;

    -ms-grid-column: 1;
}

.score-row > .score-row-nickname {
    word-wrap: break-word;
    color: blue;
    justify-self: left;

    grid-column: 2;

    -ms-grid-column: 2;
}

.score-row > .score-row-score {
    color: black;
    justify-self: end;

    grid-column: 3;
    -ms-grid-column: 3;
    font-family: "monospace";
}

.current-score {
    color: red;
}

/* Modal (background) */
.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgb(0, 0, 0);
    background-color: rgba(0, 0, 0, 0.4);
}

/* Modal Content */
.modal-content {
    background-color: #fefefe;
    margin: 15% auto; /* 15% from the top and centered */
    padding: 20px;
    border: 1px solid #888;
    width: 20%;
    top: 25%;
    -webkit-box-shadow: 5px 10px 76px 1px rgba(0, 0, 0, 0.8);
    -moz-box-shadow: 5px 10px 76px 1px rgba(0, 0, 0, 0.8);
    box-shadow: 5px 10px 76px 1px rgba(0, 0, 0, 0.8);
}

/* Modal Header */
.modal-header {
    padding: 2px 16px;
    background-color: #5cb85c;
    color: white;
    text-align: center;
}

/* Modal Body */
.modal-body {
    padding: 2px 16px;
}

/* Modal Content */
.modal-content {
    position: relative;
    background-color: #fefefe;
    margin: auto;
    padding: 0;
    border: 1px solid #888;
    width: 40%;
    /*height: 25%;*/
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    -webkit-animation-name: animatetop;
    -webkit-animation-duration: 0.4s;
    animation-name: animatetop;
    animation-duration: 0.4s
}

/* Add Animation */
@-webkit-keyframes animatetop {
    from {
        top: -300px;
        opacity: 0
    }
    to {
        top: 0;
        opacity: 1
    }
}

@keyframes animatetop {
    from {
        top: -300px;
        opacity: 0
    }
    to {
        top: 0;
        opacity: 1
    }
}

.modal-body > form {
    text-align: center;
}

.modal-body > form > label {
    font-size: 2em;
}

.modal-body > form > input[type="text"] {
    font-family: "Agency FB", serif;
    font-size: 3em;
    color: red;
    background-color: inherit;
    border: none;
}

#nicknameInput::-webkit-input-placeholder {
    color: #aaaaaa;
    opacity: 0.4;
}

#nicknameInput:-moz-placeholder {
    color: #aaaaaa;
    opacity: 0.4;
}

#nicknameInput::-moz-placeholder {
    color: #aaaaaa;
    opacity: 0.4;
}

#nicknameInput:-ms-input-placeholder {
    color: #aaaaaa;
    opacity: 0.4;
}

#nicknameInput:-ms-input-placeholder {
    color: #aaaaaa;
    opacity: 0.4;
}

.button {
    background: #75cf3a;
    background-image: -webkit-linear-gradient(top, #75cf3a, #26a809);
    background-image: -moz-linear-gradient(top, #75cf3a, #26a809);
    background-image: -ms-linear-gradient(top, #75cf3a, #26a809);
    background-image: -o-linear-gradient(top, #75cf3a, #26a809);
    background-image: linear-gradient(to bottom, #75cf3a, #26a809);
    text-shadow: 3px 3px 12px #666666;
    -webkit-box-shadow: 3px 3px 12px #666666;
    -moz-box-shadow: 3px 3px 12px #666666;
    box-shadow: 3px 3px 12px #666666;
    font-size: 25px;
    font-family: "Agency FB", serif;
    color: #ffffff;
    padding: 10px 20px 10px 20px;
    text-decoration: none;
}

.button:hover {
    background: #bd5d5d;
    background-image: -webkit-linear-gradient(top, #bd5d5d, #7d0b0b);
    background-image: -moz-linear-gradient(top, #bd5d5d, #7d0b0b);
    background-image: -ms-linear-gradient(top, #bd5d5d, #7d0b0b);
    background-image: -o-linear-gradient(top, #bd5d5d, #7d0b0b);
    background-image: linear-gradient(to bottom, #bd5d5d, #7d0b0b);
    text-decoration: none;
}

input, button, label {
    vertical-align: middle;
}

/* Tiles colors*/

.tile {
    background-color: honeydew;
}

.tile2 {
    background-color: #f7ffcc;
}

.tile4 {
    background-color: #f7ff00;
}

.tile8 {
    background-color: #cc9731;
}

.tile16 {
    background-color: burlywood;
}

.tile32 {
    background-color: chocolate;
}

.tile64 {
    background-color: crimson;
}

.tile128 {
    background-color: blue;
}

.tile256 {
    background-color: darkgreen;
}

.tile512 {
    background-color: gold;
}

.tile1024 {
    background-color: deeppink;
}

.tile2048 {
    background-color: purple;
}

.box-with-shadow {
    /*border: solid 1px;*/
    -webkit-box-shadow: 3px 5px 25px 3px rgba(0, 0, 0, 0.2);
    -moz-box-shadow: 3px 5px 25px 3px rgba(0, 0, 0, 0.2);
    box-shadow: 3px 5px 25px 3px rgba(0, 0, 0, 0.2);
    padding: 10px;
}

.box-with-shadow > .title {
    font-size: 2em;
    text-align: center;
}

.box-with-shadow > .content {
    margin: 10px;
}