simple bigger radiobuttons src: http://jsfiddle.net/j9bAe/1/
input[type=radio] {
display: none;
}
input[type=radio] + label::before {
content: '';
display: inline-block;
border: 1px solid #000;
border-radius: 50%;
margin: 0 0.5em;
width: 20px;
height: 20px;
}
input[type=radio]:checked + label::before {
background-color: #000;
}