body {
    font-family: "Source Sans Pro", sans-serif;
    text-align:  center;
}

header {
    margin:  0 auto;
    text-align:  center;
    padding: 10px 0;
}

ul {
    padding:  0;
    list-style:  none;
    margin: 0;
}


a, a:focus, a:active, a:visited {
    text-decoration:  none;
    color: initial;
}

section {
    padding: 15px 0;
}

nav {
    padding-top: 20px;
}

.links li {
    padding: 10px;
    background: #107cb5;
    margin-bottom: 1px;
    font-weight: 300;
}

.links a {
    color: #fff;
}

.materias li {
    padding: 5px 0;
    border-bottom: 1px solid #e0e0e0;
    font-size: 13px;
}

h2 {
    text-transform:  uppercase;
    color: #137bb5;
    letter-spacing: 0.01em;
    font-size: 20px;
    margin:  0;
}

h2:after {
    background: #137bb5;
    text-align: center;
    display: block;
    height: 3px;
    width: 50px;
    content: '';
    margin-top: 10px;
    margin: 0 auto;
    margin-top: 10px;
}


.materias {
    padding-top: 10px;
}

.app {
    background: #cecccc91;
    padding: 20px;
    font-size: 13px;
}

.app h2 {
    padding:  0;
    margin:  0;
}