body
{ 
background-image: url('images/background.jpg');
background-repeat: repeat;
}

.mainlogo
{
position:relative;top:25px;
}
.mainscreen
{
border: 2px solid black;
width: 850px;
background: white;
position:relative;top:50px;
}

.center1
{ 
margin-left: auto;
margin-right: auto;
}
 
.center2
{ 
text-align: center;
}

A:link {text-decoration: underline; color: #225EBD;}
A:visited {text-decoration: underline; color: #225EBD;}
A:active {text-decoration: none}
A:hover {text-decoration: underline; color: red;}

.class2 A:link {text-decoration: underline overline}
.class2 A:visited {text-decoration: underline overline}
.class2 A:active {text-decoration: underline overline}
.class2 A:hover {text-decoration: underline; color: green;}