Here's my version of that nice CSS solution JS Fiddle example posted above.
HTML
<div id="donate">
<label class="blue"><input type="radio" name="toggle"><span>$20</span></label>
<label class="green"><input type="radio" name="toggle"><span>$50</span></label>
<label class="yellow"><input type="radio" name="toggle"><span>$100</span></label>
<label class="pink"><input type="radio" name="toggle"><span>$500</span></label>
<label class="purple"><input type="radio" name="toggle"><span>$1000</span></label>
</div>
CSS
body {
font-family:sans-serif;
}
#donate {
margin:4px;
float:left;
}
#donate label {
float:left;
width:170px;
margin:4px;
background-color:#EFEFEF;
border-radius:4px;
border:1px solid #D0D0D0;
overflow:auto;
}
#donate label span {
text-align:center;
font-size: 32px;
padding:13px 0px;
display:block;
}
#donate label input {
position:absolute;
top:-20px;
}
#donate input:checked + span {
background-color:#404040;
color:#F7F7F7;
}
#donate .yellow {
background-color:#FFCC00;
color:#333;
}
#donate .blue {
background-color:#00BFFF;
color:#333;
}
#donate .pink {
background-color:#FF99FF;
color:#333;
}
#donate .green {
background-color:#A3D900;
color:#333;
}
#donate .purple {
background-color:#B399FF;
color:#333;
}
Styled with coloured buttons :)