html, body {
    height: 100%;
}
body {
    display: flex;
    flex-flow: column;

    background: #eee;
    color: #222;
    font-size: 1rem;
    font-family: "Liberation Sans", Arial, sans-serif;
    line-height: 1.5;
    margin: 0;
}

.hidden { display: none; }

h1 {
    border-bottom: 1px solid #aaa;
    margin: 0;
}

a {
    color: rgb(0, 0, 255);
}

#header {
    padding: 1rem;
    padding-left: .75rem;
    padding-right: .75rem;
    background: #472987;
}
#header a {
    color: #eee;
    text-decoration: none;
}

#menu {
    background: #222;
    color: #eee;
    padding: .25rem;
    padding-left: .75rem;
    padding-right: .75rem;
}
#menu a { color: #eee; float: right; }
#menu span { float: left; }

#container {
    display: flex;
    flex-grow: 1;
}

#main {
    padding: .75rem;
    flex-grow: 1;
}
#main img {
    display: block;
    height: auto;
    max-width: 100%;
}

#nav {
    background: #fff;
    padding: .75rem;
    line-height: 1.6;
}
#nav ul {
    margin: 0;
    padding-left: .75rem;
}

@media only screen and (max-width: 40rem) {
    #container {
        flex-flow: column;
    }
}

#footer {
    background: #fff;
    padding: .75rem;
}
#footer small {
    float: right;
}

.alert {
    padding: .5rem;
    margin-bottom: .5rem;
    border: 1px solid transparent;
    border-radius: .15rem;
}
.alert.info {
    color: #0c5460;
    background-color: #d1ecf1;
    border-color: #62b1bd;
    background: linear-gradient(0deg, rgba(167,223,232,1) 0%, rgba(209,236,241,1) 100%);
}
.alert.success {
    color: #155724;
    background-color: #d4edda;
    border-color: #56bf6e;
    background: linear-gradient(0deg, rgba(165,227,180,1) 0%, rgba(212,237,218,1) 100%);
}
.alert.danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #c8848c;
    background: linear-gradient(0deg, rgb(249, 180, 186) 0%, rgb(248, 215, 218) 100%);
}
.alert.warning {
    color: #856404;
    background: #fff3cd;
    border-color: #dfc678;
    background: linear-gradient(0deg, rgb(251, 229, 161) 0%, rgb(255, 243, 205) 100%);
}