body{
    background-color: #00a478;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

p{
    text-align: center;
}

h3 {
	text-align: center;
	color: white;
}

h1{
	text-align: center;
	font-size: 2.5em;
	color: white;
}

<style>
.aligncenter {
    text-align: center;
}

.v2logo {
	margin-bottom: 1em;
}

.mainpageparagraph {
	text-align: center;
	color: white;
	font-size: 1em;
}

.mainmenu {
	border: 4px solid white;
	border-radius: 16px;
	margin-left: 15%;
	margin-right: 15%;
	margin-top: 9%;
	background-color: #ffffff;
}

.mainmenubutton {
	margin: auto;
	display: block;
	color: #00a478;
	background-color: white;
	width: 100%;
	border-radius: 10px;
	text-align: center;
	font-size: 1.3em;
	margin-bottom: 2em;
	margin-top: 2em;
	border: 2px solid #00a478;	
}

.mainmenubutton > p {
	margin-top: 15px;
	margin-bottom: 15px;
	color: #00a478;
}

@keyframes fadeIn {
  0% { opacity: 0; }
  100% { opacity: 1; }
}

.fade-in-image {animation: fadeIn 5s;}

</style>