html {
    height: 110%;;
}

header {
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    background-color: #333;
    color: white;
    padding: 5px;
}

img#logo {
    height: 100px;
    float: left;
    margin: 10px;
    transition: all .3s;
}

article {
    margin: 140px 15px 50px 15px;
    padding: 15px;
    border-radius: 10px;
    background-color: #EEE;
}