.required {
    font-weight: bold;
    color: #dc3545;
}
.required-border {
    border: 1px solid #C00;
    padding: 10px 15px 0;
}
.required-if {
    font-weight: bold;
    color: #ffca41;
}

.img-bg {
    overflow: hidden;
    height: 0;
    background-size: cover;
    background-position: center;
}

.img-16-9 {
    padding-top: 56.25%;
}

.img-8-5 {
    padding-top: 62.5%;
}

.img-3-2 {
    padding-top: 66.66%;
}

.img-4-3 {
    padding-top: 75%;
}

.img-1-1 {
    padding-top: 100%;
}