HTML＋CSSだけで作るエアメール封筒

<article class="sample">
    <section>
        <img src="stamp.png" class="stamp">
        <time>2015.07.31</time>
        <h2><a href="#">コピペで簡単！CSSだけで作れる郵便切手と消印風スタンプ</a></h2>
        <p>今月7月は別名｢文月｣と呼ばれ、特に23日には｢文月ふみの日｣として様々なイベントが行われます。今回はそんなお手紙と関係の深い7月にちなんで ...<a href="#">続きを読む &raquo;</a></p>
    </section>
</article>

.sample {
    position: relative;
    padding: 14px;
    width: 480px;
    background: -webkit-repeating-linear-gradient(135deg, #d43 0px, #d43 20px, #fec 20px, #fec 40px, #226 40px, #226 60px, #fec 60px, #fec 80px);
    background: repeating-linear-gradient(135deg, #d43 0px, #d43 20px, #fec 20px, #fec 40px, #226 40px, #226 60px, #fec 60px, #fec 80px);
    -webkit-box-shadow: 0 0 6px rgba(0,0,0,0.6);
    -moz-box-shadow: 0 0 6px rgba(0,0,0,0.6);
    box-shadow: 0 0 6px rgba(0,0,0,0.6);
}
.sample section{
    padding: 20px;
    background: #fec;
    color: #430;
    font-size:14px;
}
.sample h2{
    margin: 0;
}
.sample h2 a{
    margin: 0;
    color: #430;
    font-size: 19px;
}
.sample section p{
    margin: 16px 0 0;
    line-height: 1.61;
}
.sample section p a{
    display: block;
    margin: 6px 0 0;
    color: #27c;
}
.sample .stamp{
    float: right;
    margin:0 0 20px 20px;
    padding: 10px;
    background: #fff;
    background: radial-gradient(at center, transparent, transparent 5px, #fff 6px);
    background: -webkit-gradient(radial, center center, 5, center center, 6, from(#fff), color-stop(100%,#fff), color-stop(0%,rgba(255,255,255,0)));
    background-position: -10px -10px;
    background-size: 20px 20px;
    -webkit-filter: drop-shadow(0 1px 2px rgba(0,0,0,0.4));
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.4));
}
.sample time{
    position: absolute;
    top: 140px;
    right: 6px;
    display: inline-block;
    padding: 10px;
    width: 100px;
    height: 100px;
    border: 5px double #430;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    border-radius: 50%;
    color: #430;
    text-align: center;
    font-size: 22px;
    font-family: 'Bree Serif', serif;
    line-height: 100px;
    -webkit-transform: rotate(-16deg);
    -ms-transform: rotate(-16deg);
    transform: rotate(-16deg);
}
.sample time:before{
    position: absolute;
    top: 14%;
    display: block;
    padding: 0 0 8px;
    width: 82%;
    border-bottom:1px solid #430;
    content: 'Posted at :';
    font-size: 16px;
    line-height: 1;
}
.sample time:after{
    position: absolute;
    bottom: 16%;
    display: block;
    padding: 6px 0 0;
    width: 82%;
    border-top: 1px solid #430;
    content: 'from TOKYO';
    font-size: 13px;
    line-height: 1;
}