* {
    -webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */
    -moz-box-sizing: border-box;    /* Firefox, other Gecko */
    box-sizing: border-box;
}

body {
    margin: 0;
    color: #ecf0f1;
}

ul {
    list-style: none;
}

ul li {
    display: inline-block;
    padding: 10px 15px;
}

nav a {
    color: #ecf0f1;
    text-decoration: none;
    text-transform: uppercase;
    padding: 15px 20px;
    border-radius: 8px;
}

nav a:hover {
    background-color: #ecf0f1;
    color: #2c3e50;
}

nav a.active {
    background: #1abc9c;
}

#main-menu {
    position: fixed;
    text-align: center;
}

#section1 {
    background-color: #34495E;
}

#section2 {
    background-color: #4B77BE;
}

#section3 {
    background-color: #22313F;
}

#section4 {
    background-color: #F4B350;
}

#section5 {
    background-color: #F2784B;
}

section {
    width: 100%;
    margin: 0;
    padding: 200px 100px;
}