delta/css/style.css

body {
    background-color: #00897b;
/*
    background-color: #ffffff;
*/

	margin:80px 80px 100px 100px;
}

.icon {
  width: 60px;
  height: 60px;
}

.flex{
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-content: space-around;
    align-items: center;
    min-height: 70vh;
}

.a{
    padding: 20px;
}

td {
    padding: 15px;
}

div#header {
	position:fixed;
	top:0px;
	left:0px;
	width:100%;
	color:#CCC;
	background:#333;
	padding:20px;
}
div#footer {
	position:fixed;
	bottom:0px;
	left:0px;
	width:100%;
	color:#CCC;
	background:#333;
	padding:8px;
}

.button {

    color: white;
    padding:54px 32px;
    text-align: center;
    text-decoration: none;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
    -webkit-transition-duration: 0.4s; 
    transition-duration: 0.4s;
}

.button-normal {

    color: white;
    padding:18px 32px;
    text-align: center;
    text-decoration: none;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
    -webkit-transition-duration: 0.4s; 
    transition-duration: 0.4s;
}
.button:hover {
    box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24),0 17px 50px 0 rgba(0,0,0,0.19);
}

.button-normal:hover {
    box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24),0 17px 50px 0 rgba(0,0,0,0.19);
}