css で派手なボタンをいくつか作成しましたが、IE9 では境界線が丸くなりません。
HTML:
<div id="buttons">
<a href="#"></a>
<a href="#"></a>
<a href="#"></a>
<a href="#"></a>
<a href="#"></a>
</div>
CSS:
#buttons a {
margin: 2px 4px;
border-radius: 13px;
height: 25px;
width: 25px;
display: block;
float: left;
position: relative;
background: rgb(178,91,91);
background: -moz-linear-gradient(top, rgba(178,91,91,1) 0%, rgba(252,200,200,1) 26%, rgba(89,52,52,1) 51%, rgba(254,254,254,1) 75%, rgba(85,52,54,1) 94%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(178,91,91,1)), color-stop(26%,rgba(252,200,200,1)), color-stop(51%,rgba(89,52,52,1)), color-stop(75%,rgba(254,254,254,1)), color-stop(94%,rgba(85,52,54,1)));
background: -webkit-linear-gradient(top, rgba(178,91,91,1) 0%,rgba(252,200,200,1) 26%,rgba(89,52,52,1) 51%,rgba(254,254,254,1) 75%,rgba(85,52,54,1) 94%);
background: -o-linear-gradient(top, rgba(178,91,91,1) 0%,rgba(252,200,200,1) 26%,rgba(89,52,52,1) 51%,rgba(254,254,254,1) 75%,rgba(85,52,54,1) 94%);
background: -ms-linear-gradient(top, rgba(178,91,91,1) 0%,rgba(252,200,200,1) 26%,rgba(89,52,52,1) 51%,rgba(254,254,254,1) 75%,rgba(85,52,54,1) 94%);
background: linear-gradient(to bottom, rgba(178,91,91,1) 0%,rgba(252,200,200,1) 26%,rgba(89,52,52,1) 51%,rgba(254,254,254,1) 75%,rgba(85,52,54,1) 94%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#b25b5b', endColorstr='#553436',GradientType=0 );
box-shadow: 0 0 3px rgba(0,0,0,0.2);
}
#buttons a:after {
background: #a62434;
background: -moz-linear-gradient(top, #ea5160 0%, #a62434 40%, #771b22 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ea5160), color-stop(40%,#a62434), color-stop(100%,#771b22));
background: -webkit-linear-gradient(top, #ea5160 0%,#a62434 40%,#771b22 100%);
background: -o-linear-gradient(top, #ea5160 0%,#a62434 40%,#771b22 100%);
background: -ms-linear-gradient(top, #ea5160 0%,#a62434 40%,#771b22 100%);
background: linear-gradient(to bottom, #ea5160 0%,#a62434 40%,#771b22 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#771b22', endColorstr='#ea5160',GradientType=0 );
box-shadow: inset 0 0 3px rgba(91,22,23,0.5);
display: block;
content: '';
position: absolute;
height: 21px;
width: 21px;
top: 2px;
left: 2px;
border-radius: 11px;
}