body {
    font-family: sans-serif;
    background-color: #ccc;
}
sup {
    font-size: 0.7em;
    margin-left: 1px;
}
form {
    max-width: 720px;
    margin: 0 auto;
}
form label {
    display: block;
    width: 100%;
}
.card {
    background-color: white;
    box-shadow: 0 0 5px rgba(0,0,0,0.5);
    border-radius: 5px;
    margin: 10px;
    padding: 10px 20px 20px;

    max-width: 720px;
    margin: 0 auto 10px;
}
.card-header-images {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 100%;
}
.card-header-images img {
    display: block;
    margin: 0 auto;
    width: calc(98% / var(--num-of-images));
}
body.campaign-id-1 .card-header-images img {
    width: initial;
    max-height: clamp(0px, 19vw, 150px);
}
.card-title {
    display: inline-block;
    padding: 10px 20px;
    margin-left: -20px;
    font-size: 1.2em;
    font-weight: bold;
    margin-bottom: 10px;
    color: white;
    background-color: dodgerblue;
}
.card input,
.card select,
.select2-container--default {
    display: inline-block;
    margin: 10px 0;
    font-size: 1.2em;
    max-width: 95%;
}
.card input[type="email"],
.card input[type="text"],
.card input[type="phone"] {
    width: 270px;
}
.card input[type="submit"] {
    background-color: deepskyblue;
    border: none;
    border-radius: 5px;
    color: white;
    cursor: pointer;
    font-size: 1.2em;
    padding: 10px 20px;
}
.card input[type="submit"]:hover {
    background-color: dodgerblue;
}
.checkbox_group {
    border-radius: 5px;
    border: 2px solid #ccc;
    padding: 10px 0;
    position: relative;
    margin-top: 8px;
}
.checkbox_group + .checkbox_group {
    margin-top: 16px;
}
.checkbox_group_title {
    text-transform: capitalize;
    position: absolute;
    top: -12px;
    left: 24px;
    border: 2px solid #ccc;
    border-radius: 5px;
    padding: 2px 10px;
    background: #444;
    color: white;
    font-size: 0.8em;
    font-weight: bold;
}
.checkbox_group label {
    display: block;
    padding: 0 10px;
}
.checkbox_group label:hover {
    background: linear-gradient(to right, #eee, white);
}
#gallery {
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    align-content: center;
    justify-content: center;
    column-gap: 15px;
    row-gap: 15px;
}
#gallery a {
    display: inline-block;
    width: 150px;
}
#gallery img {
    max-width: 100%;
    border: 2px solid gray;
    border-radius: 10px;
}