.header {
    display: flex;
}
.header div {
    flex: 1 1 auto;
    padding: 0 2em;
    text-align: right;
}
.header div:last-child {
    text-align: left;
}
.header img {
    height: auto;
    width: auto;
    max-height: 100%;
    max-width: 100%;
}

.alert {
    display: flex;
}
.alert strong {
    flex: 1 1 auto;
    text-align: right;
}
.alert-outline {
    background: none;
}

section {
    margin: 2em 0;
}

header h1 {
    margin: .5em;
    text-align: center;
    font-size: 20px;
    font-size: 1.5rem;
}

.main-items {
    padding-left: 0;
}
.main-items li {
    list-style-type: none;
}
.main-items li ul {
    display: none;
}

header {
    background: #333;
    padding: .5em;
    color: #efefef;
}