.form
{
    display: block;
    width: 80%;
    padding: 2rem;
    border: 1px solid black;
    background-color: white;
    margin-left: auto;
    margin-right: auto;
    margin-top: 10px;
    margin-bottom: 10px;
    border-radius: calc(2 * var(--rad));
}
    .form  *
    {
        display: block;
        font-size: 1.2rem;
        padding: calc(1 * var(--rad));
        margin: calc(3 * var(--rad));
    }
        .form  h2,
        .form  h3,
        .form  h4
        {
            font-size: 3rem;
            color: var(--blue);
        }
        .form  select,
        .form  button
        {
            width: calc(100% + (2 * var(--rad)));
        }
        .form  textarea
        {
            min-height: 150px;
        }
        .form  input,
        .form  textarea,
        .form  select
        {
            display: block;
            box-sizing: border-box;
            border:1px solid silver;
            border-radius: 6px;
            background-color: white;
            padding: calc(1 * var(--rad));
            width: calc(100% - (8 * var(--rad)));
        }
        .form label
        {
            border-bottom: 2px solid var(--blue_80);
        }
        #section_4 label
        {
            border-bottom: unset;
            margin: var(--rad);
        }
.button
{
    display: inline-flex;
    padding: calc(1 * var(--rad));
    background-color: var(--blue_30);
    border-radius: calc(2 * var(--rad));
    border: 1px solid var(--blue);
    color: black;
    font-size: 1.2rem;
    padding-left: calc(3 * var(--rad));
    padding-right: calc(3 * var(--rad));
    align-items: center;
    margin-left: auto;
    float: right;
}
    .button:hover
    {
        background-color: var(--blue_80);
        cursor: pointer;
        color: white;
    }
        .button:hover .arrow
        {
            color: white;
        }
    .button .arrow
    {
        display: inline;
        position: relative;
        font-weight: bold;
        transform: rotate(90deg);
        font-size: 2rem;
        margin-left: 20px;
    }

.error
{
    outline: 2px dashed red;
    outline-offset: calc(1 * var(--rad));
    border-radius: calc(10 * var(--rad));
}