styles.css

* {
    box-sizing: border-box;
}

body {
    background-size: cover;
    background-repeat: no-repeat;

    font-family: "Open Sans", sans-serif;
    font-size: 14pt;

    margin: 0;
    padding: 1em;
}

h2 {
    text-align: center;
}

#work_box {
    width: 55vw;
    margin: auto;
    padding: 1em;

    border: black solid 1px;
    background-color: rgba(0, 0, 0, 0.6);
    color: white;
}

#upload {
    font-family: inherit;
    font-size: inherit;

    display: block;
    width: 75%;
    margin: auto;
}

#colors div {
    border: black solid 1px;
    margin: 0.25em;
    padding: 0.5em;

    display: flex;
    justify-content: space-between;
}

span {
    display: inline-block;
}