* {
    padding: 0;
    margin: 0;
}

body {
    background: #eee;
}

ul,
li {
    list-style: none;
}

a {
    text-decoration: none;
    color: #333;
}

button {
    border: 0;
    padding: 10px 15px;
    background: #5e5ef7;
    color: #fff;
    cursor: pointer;
    font-size: 14px;
    letter-spacing: 2px;
    border-radius: 4px;
    margin: 10px 0;
    transition: all .5s;
    box-shadow: 2px 2px 10px rgba(0, 0, 0, .2);
}
h2{
    margin: 20px 0;
}

.clear {
    clear: both;
}

pre {
    max-width: 80%;
    padding: 20px;
    font-weight: 600;
    line-height: 150%;
    background: #fff;
    box-shadow: 5px 5px 30px rgba(0,0,0,.05);
}

.nav {
    position: fixed;
    z-index: 99;
    height: 100vh;
    min-width: 12%;
    background: #fff;
    box-shadow: 5px 5px 30px rgba(0, 0, 0, .1);
}

.nav ul li a {
    display: inline-block;
    padding: 10px 20px;
}

.title {
    margin-bottom: 5px;
    padding-bottom: 5px;
    border-bottom: 1px solid #ccc;
    box-sizing: border-box;
    text-align: center;
}

.title h2 {
    display: inline-block;
    padding: 10px 20px;
}

.main {
    float: right;
    width: 85%;
}