colouring-montreal/app/src/frontend/header.css

/**
 * Main header
 */
.main-header {
    z-index: 3000;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    background: #fff;
    text-decoration: none;
    box-shadow: 2px 0px 2px -2px #000;
}
@media (min-width: 768px){
    .main-header {
        width: 480px; /* to match .info-container menu width */
    }
}
.main-header .navbar {
    padding: 0;
}
.main-header .navbar-brand {
    margin: 12px;
    padding: 0;
}
.main-header .navbar-collapse {
    height: calc(100vh - 76px);
    overflow-y: auto;
    transition: height 0.3s;
}
.navbar-collapse.collapse {
    display: block ;
    height: 0;
}
.navbar .nav-link {
    padding: .5rem 1rem;
}
.navbar .navbar-toggler {
    padding: .5rem .75rem .5rem .75rem;
    margin-right: 12px;
}
.navbar .navbar-toggler-icon {
    width: 1em;
    height: 1em;
}
.navbar .close {
    display: inline-block;
    vertical-align: middle;
    height: 1em;
    padding: 0 3px;
}