Changes
width: 100%;
height: auto;
}
.mainpage-shadowbox {
color: white;
background: rgb(16,16,16);
background: rgba(0,0,0,0.3);
border-radius: 4px;
}
.mainpage-shadowbox h2, .mainpage-shadowbox h3 {
color: white;
border:none;
font-family: sans-serif;
line-height: 1.2em;
margin:0;
}
.mainpage-shadowbox h2 {
font-size: 190%;
}
.mainpage-shadowbox h3 {
font-size: 150%;
padding: 0;
}
