css

body {
    background: rgba(255, 255, 255, 1.0);
}
* {
    font-family: 'Source Sans Pro', 'Helvetica Neue', Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color: rgba(0, 0, 0, 1.0);
    font-size: 16px;
    line-height: 115%;
    color: #34495e;
}
h1 {
    font-size: 32px;
    font-weight: bold;
    border-bottom: solid 1px rgb(234, 236, 239);
}

h2 {
    font-size: 24px;
    font-weight: bold;
    border-bottom: solid 1px rgb(234, 236, 239);
}
h3 {
    font-size: 20px;
    font-weight: bold;
}
a {
    color: #42b983;
    font-weight: bold;
}
.formula {
    width: 250px;
}

.mini_list > li {
    font-size: 16px;
}

.center {
    height: 600px;
    text-align: center;
}