a.css

html,

/*Global Styles*/
body{
    width: 100%;
    height: 100%;
}

body{font-family:'Raleway'; font-size: 15px;

    }

.text-vertical-center{
    display: table-cell;
    text-align: center;
    vertical-align: middle;
}

.text-vertical-center h1{
    font-size: 4.5em;
    font-weight: 700;
    margin: 0;
    padding: 0;
}

/*Header*/
.header{
    position: relative;
    display: table;
    width: 100%;
    height: 700px;
    background-image:url("http://bestanimations.com/Nature/clouds-flowing-over-lake-mountains-nature-animated-gif.gif"); 
    -webkit-background-size:cover;
    -moz-background-size:cover;
    -o-background-size:cover;
    text-shadow: 2px 2px 4px white;
    
}


ul{
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
}

li{
    float: left;
}

li a{
    display: inline-block;
    color: white;
    text-align:center;
    padding: 14px 16px;
    text-decoration: none;
}

li a:hover{
    background-color: #111;
}
section {
  display: blank;

}
.space {
  display: table;
  width: 100%;
  height: 400px;
  color: #333
  background-size: cover;
}
table, td {
    border: 3px solid white;
    border-spacing: 1px;
    padding: 20px;
}
table {
table-layout: fixed;
    width: 40%;
    margin-left: auto;
margin-right: auto;
}
td:hover {
  background-color: #D6FFD6	;
}