* {
    margin: 0;
    padding: 0;
}
body{
    background-color: grey;
    color: darkgrey;
    font-family: calibri, sans-serif;
}
h1 {
    font-size: 3.5em;
    font-weight: bold;
}

/* logo */
#logo{
    font-size: 3.5em;
    position: absolute;
    top: 2.5%;
    right: 2.5%;
}
#logo a{
    color: darkgrey;
    text-decoration: none;
}

/* framing content */
.center { 
    height: 100%;
}
.center > div {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    width: 50%;
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}

/* footer including navigation */
#footer{
    margin-top: 10%;
    text-align: center;
}
#navigation{
    margin-bottom: 2.5%;
    text-transform: uppercase;
}
#navigation a{
    color: darkgrey;
    text-decoration: none;
}
#navigation a:hover{
    color: rgb(88, 88, 88);
}