main.css

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0;
    margin: 0;
    height: 100vh;
    background: linear-gradient(
            0deg,
            rgb(17, 161, 149) 0%,
            rgb(136, 34, 195) 100%
    );
}

h1 {
    margin: 0px;
    margin-bottom: 10px;
    font-size: 2.9em;
    color: lightgrey;
}

.controls {
    display: grid;
    grid-template-columns: 50px 150px;
    color: lightgrey;
    margin-bottom: 20px;
}

/* Action buttons */

.actions {
    display: flex;
    flex-direction: row;
    justify-content: space-evenly;
    align-items: flex-end;
    width: 720px;
    height: 100px;
    margin: 2%;
}

.action {
    color: lightgrey;
    font-family: "Helvetica Neue", sans-serif;
    font-size: 20px;
    line-height: 20px;
    font-weight: 300;
    text-align: center;
    text-decoration: none;
    text-transform: uppercase;
    padding: 20px;
    width: 120px;
}

.action:hover {
    background-color: darkgray;
    color: white;
    font-weight: 700;
}

.action[href=""] {
    display: none;
}

.red {
    background-color: red;
}

.yellow {
    background-color: yellow;
}