html {
    height: 100%;
    width: 100%;
    background-color: lightgray;
    overflow: auto;
}
main {
    width: 100%;
    padding-bottom: 3%;
    box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.5);
}
body {
    width: 96%;
    margin: 0 auto;
    border: 1px solid;
    overflow: inherit;
    background-color: #fff;
    text-align: center;
    font-family: verdana, arial, sans-serif;
    color: #000;
    font-size: 16px;
    font-style: normal;
    box-shadow: 5px 5px 10px green;
}
h3 {
    box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.5);
}
nav {
    width: 100%;

}
nav ul {
    text-align: center;
    margin: 0 0 0 0;
    padding-left: 0;
}
nav ul li {
    list-style-type: none;
    width: 25%;
    background: linear-gradient(#9fb3b5, #e3e9ea, #7c9799);
    float: left;
    display: flex;
    justify-content: space-evenly;
    flex-direction: row;
    flex: 1;
}
a {
    text-decoration: none;
}
nav ul li a {
    font-size: 1.7rem;
    opacity: 0.5;
    filter: alpha(opacity=50);
}
nav ul li a:hover,
nav ul li a:focus {
    color: firebrick;
    background-color: rgba(60, 255, 0, 0.2);
    letter-spacing: 5px;
}
#logo {
    margin-top: 25px;
    padding-top: 10%;
    background-image: url(images/logo.png);
    background-repeat: no-repeat;
    background-position: center;
    box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.5);
}
#disc {
    border-radius: 50%;
    display: inline-block;
    opacity: 0.8;
    width: 400px;
    height: 400px;
    margin-top: 10%;
    background-image: -moz-radial-gradient(45px 45px 45deg, circle cover, grey 0%, black 100%, black 95%);
    background-image: -webkit-radial-gradient(45px 45px, circle cover, grey, black);
    background-image: radial-gradient(45px 45px 45deg, circle cover, grey 0%, black 100%, black 95%);
    animation-name: revolutie;
    animation-duration: 3s;
    animation-iteration-count: infinite;
    animation-timing-function: linear;
}
@keyframes revolutie {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}
#center {
    width: 105px;
    height: 105px;
    background: orange;
    position: relative;
    top: 37%;
    left: 37%;
    display: block;
    border: 5px solid #fff;
    border-radius: 50%;
}

#pager a{
	font-size: 3rem;
	font-weight: bolder;
	text-decoration: none;
	border-radius: 50%;
		box-shadow: 4px 4px 15px rgba(0,0,0,0.8);
	padding-left: 10px;
	padding-right: 10px;
}

#pager a:hover{
	opacity: 0.7;
	filter: alpha(opacity=40);
	font-size: 3.2rem;
	background-image: linear-gradient(to bottom, hsl(0, 80%, 50%), #bada55)
}

#vorige{
	z-index: 1;
	margin-left: 10px;
	position: absolute;
	top: 45%;
	left: 4%;
	margin-right: 15px;
}

#volgende{
	z-index: 1;
	margin-right: 10px;
	position: absolute;
	top: 45%;
	right: 4%;
}

footer{
    position:static;
    bottom: 0;
    right: 0;
    left: 0;
    margin: 0;
    float: left;
    text-align: center;
    width: 100%;
    padding-top: 20px;
    padding-bottom: 10px;
    background: linear-gradient(to right, red, orange, yellow, green, blue, indigo, violet)
}

footer img{
    margin:0;
    width: 4%;
    
}
footer p{
    margin: 0;
    color: firebrick;
    
}