styles.css

@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@100;500&display=swap');

body {
    background-color: #f2f2f2;
    display: flex;
    overflow: hidden;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-family: 'Roboto', sans-serif;
    height: 100vh;
}

.keys {
    display: flex;
    list-style: none;
}

li {
    box-shadow: 0px -6px 10px rgba(255, 255, 255, 1), 0px 4px 15px rgba(0, 0, 0, 0.15);
    transition: 0.5s;
    height: 2.5em;
    font-size: 1em;
    width: 3em;
    margin: 0.3em;
    background-color: #f2f2f2;
    border-radius: 0.5em;
    line-height: 2.5em;
    letter-spacing: 1px;
    text-align: center;
}

li:hover {
    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.15);
    cursor: pointer;
    top: 3px;
}

#red {
    background-color: #a3f7bf;
    width: 5em;
}

#blue {
    background-color: #9aebed;
    width: 6em;
}

#rebeca {
    background-color: #fecd1a;
    width: 8em;
}

#green {
    background-color: #fa86be;
    width: 6em;
}

#up {
    background-color: #8594e4;
    width: 8em;
}

#yellow {
    background-color: #fffcab;
    width: 5em;
}

#grey {
    background-color: #fd3a69;
    width: 3.3em;
}

#one {
    background-color: #faafff;
    width: 5em;
}

#two {
    background-color: black;
    width: 24.5em;
}