body { background-image: url(http://sachips.byeto.jp/demo/images/bk01.png); } .touka01 { padding: 10px; background-color: #ff0000; filter:alpha(opacity=15); -moz-opacity:0.15; -khtml-opacity:0.15; opacity:0.15; } .touka02 { padding: 10px; background-color: rgba(255,0,0,0.15); }
<p class="touka01">背景も文字も透過</p> <p class="touka02">背景のみ透明化(文字は透過しない)</p>