html {
    height: 100%;
    width: 100%;
    background-color: lightgray;
    overflow: auto;
}

body {
    width: 96%;
    margin-top: 0;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 5%;
    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;
}

.test {
    margin: 0;
    box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.5);
}

main {
    margin: 0;
    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;
    display: flex;

}

nav ul li{
    list-style-type: none;
    flex: 1;
}

nav ul li{
    background: linear-gradient(#9FB3B5, #E3E9EA, #7C9799)
}

a {
    text-decoration: none;

}

nav ul li a{
    font-size: large;
    opacity: o.5;
    filter: alpha(opacity=50);
    transition: letter-spacing 1s, color 2s;
}

nav ul li a:hover,
nav ul li a:focus {
    letter-spacing: 5px;
    color: firebrick;
}

#logo {
    margin-top: 15px;
    padding-top: 10%;
    background-image: url(images/logo.png);
    background-repeat: no-repeat;
    background-position: center;    
    position: relative;
    display: block;
    width: 100vw;
    height: 100%;
    
}

main {
    width: 100%;
    margin: 0;
    padding-bottom: 3%;
    
}

#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: rad nial-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: 0.5px 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, 0.5);
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: fixed;
    top: 45%;
    left: 4%;
}
#volgende {
    z-index: 1;
    margin-right: 10px;
    position: fixed;
    top: 45%;
    right: 4%   ;
    
}


footer img {
    margin: 0;
    color: firebrick;
}
footer p {
    margin: 0;
    color: firebrick;
}

ul {
    list-style-type: none;
}

a {
    text-decoration: none;
}

form {
    width: 100%;
    margin: 0;
    text-align: center;
}

legend {
    font-size: 1.5em;
    font-weight: bold;
}
fieldset {
    border: solid 2px #009D22;
    width: 70%;
    margin: auto;
    border-radius: 2%;
    background-image: linear-gradient(to bottom, hsl(0, 80%, 50%), #bada55);
}

input, select, textarea {
    border: solid 1px rgb(0, 0, 0);
    margin: 5px;
    padding: 5px 30px 5px 50px;
    width: 50%;
    text-align: center;
    font-size: 1em;
    border-radius: 5px;
}

input:focus, textarea:focus {
    box-shadow: 6px 6px 10px #2eef1e;
}
select {
    width: 35%;
}

input[type=date] {
    width: 25%;
}
input[type=checkbox], input[type=radio] {
width: 4%;
}
input[type=submit] {
    background-color: #bada55;
    width: 43%;
    opacity: 0.4;
}
input[type=submit]:hover {
    opacity: 1;
    transition: opacity 0.5s linear;
}
#contact {
    margin-left: auto;
    margin-right: auto;
    width: 50vw;
    text-align: justify;
    line-height: 1.6em;
}
#contact span {
    font-size:  1.3rem;
    letter-spacing: 5px;
    text-shadow: 2px 2px 4px #2eef1e;
    text-transform: uppercase;
}
input[type=submit]:hover {
    opacity: 1;
    transition: opacity 0.5s linear;
}


@media  screen and (max-width: 800px) {
#disc {
    width: 50vh;
    height: 50vh;
}

#center {
    width: 10vh;
    height: 10vh;
}

#footer {
        width: 100%;
    }
}

@media screen and (max-width: 768px) {
   
    /* Navigation */
    .test ul {
      flex-direction: column;
      justify-content: center;
      align-items: center;
      height: 100%;
    }
    .test li {
      margin: 10px 0;
    }
  
    /* Disc animation */
    #disc {
      width: 70%;
      height: 70%;
      margin: 0 auto;
    }
  
    /* Scroll buttons */
    #pager {
      position: absolute;
      bottom: 0;
      width: 100%;
      display: flex;
      justify-content: space-between;
      padding: 10px;
    }
  
    /* Footer */
    .test footer {
      text-align: center;
      margin-top: 30px;
    }
  }