body {
    background-color: #000000;
    color: #FFFFFF;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 12px;
    margin: 0;
    padding: 0;
}

* {
    margin: 0;
    padding: 0;
    overflow: hidden;
}

h1 {
    font-size: 18px;
    font-weight: bold;
    margin: 0;
    padding: 0;
}

h2 {
    font-size: 16px;
    font-weight: bold;
    margin: 0;
    padding: 0;
}

.sorting {
    background-color: #5e5e5e;
    color: #FFFFFF;
    font-size: 12px;
    font-weight: bold;
    padding: 5px;
}

.sorting .computer, .human {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(10, 100px);
    grid-gap: 15px;
    padding: 10px;
    justify-content: center;
}

.box {
    background-color: #5e5e5e;
    border: 1px solid #000000;
    height: 100px;
    width: 100px;
}
.box[done="true"] {
    border: 2px solid #FFFFFF;
}
.box.active {
    border: 3px solid #ff0000;
}
.box span {
    display: block;
    font-size: 75px;
    padding: 5px;
    text-align: center;
}

button {
    background-color: #5e5e5e;
    border: 1px solid #000000;
    color: #FFFFFF;
    font-size: 30px;
    font-weight: bold;
    padding: 5px;
    width: 100%;
}