body {
    font-family: sans;
    background-color: #fbfbfb;
    margin: auto;
    max-width: 20em;
}

h1 {
    text-align: center;
}

.preview {
    width: 50%;
    margin-left: auto;
    margin-right: auto;
}

.hex {
    text-align: center;
    margin-top: 0.5em;
}

fieldset {
    margin-bottom: 1em;
    margin-top: 1em;
}

.color-block {
    width: 100%;
    aspect-ratio: 1;
    border: 1px black solid;
}

.slider {
    display: grid;
    grid-template-columns: 35% max-content;
    grip-gap: 1em;
}