.required {
    color: red !important;
}

header {
    background-color: transparent;
    background-size: cover;
}

@media (max-width: 979px) {
    header {
        background: url(/assets/img/background-menu.png) no-repeat;
        background-size: cover;
    }
}

header > button#sidebar-toggle {
    background-color: transparent;
    background-size: 30px;
    border: none;
    cursor: pointer;
    top: 30px;
    left: 30px;
    padding-left: 1rem;
    z-index: 1000;
}