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

/**
 * Main header
 */
.main-header {
    z-index: 3000;
    position: absolute;
    top: 0;
    left: 0;
    height: 76px;
    width: 100%;
    text-decoration: none;
}
@media (min-width: 990px){
    .main-header {
        width: 480px; /* to match .info-container menu width */
    }
}
.main-header.navbar {
    padding: 0;
}
.nav-header {
    z-index: 1;
    display: flex;
    justify-content: space-between;
    width: 100%;
    padding: 12px;
    background: #fff;
    border-right: 1px solid #000;
}
.nav-header a {
    padding: 0;
    margin: 0;
}
.navbar .navbar-toggler {
    padding: .5rem .75rem .5rem .75rem;
}
.navbar .navbar-toggler-icon {
    width: 1em;
    height: 1em;
}
.navbar .close {
    display: inline-block;
    vertical-align: middle;
    height: 1em;
    padding: 0 3px;
}
.main-header .navbar-collapse {
    height: calc(100vh - 76px);
    display: block;
    overflow-y: auto;
    transition: transform 0.3s;
    transform: translateY(0);
    background: #fff;
    border-right: 1px solid #000;
}
.main-header .navbar-collapse > ul:last-child {
    padding-bottom: 5rem;
}
.navbar-collapse.collapse {
    transform: translateY(-100vh);
}
.navbar .nav-link {
    padding: .5rem 1rem;
}
.navbar hr {
    height: 2px;
    width: auto;
    margin: 1em;
}