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From 2014.igem.org

.reveal-modal-bg { position: fixed; height: 100%; width: 100%; background: #000; background: rgba(0,0,0,.8); z-index: 100; display: none; top: 0; left: 0; }

.reveal-modal { display:none; top: 100px; left: 45%; margin-left: -300px; width: 640px; height: 360px; background: #eee url(../img/modal-gloss.png) no-repeat; position: absolute; z-index: 101; padding: 30px 40px 34px; -moz-border-radius: 5px; -webkit-border-radius: 5px; border-radius: 5px; -moz-box-shadow: 0 0 10px rgba(0,0,0,.4); -webkit-box-shadow: 0 0 10px rgba(0,0,0,.4); -box-shadow: 0 0 10px rgba(0,0,0,.4); }

.reveal-modal.small { width: 200px; margin-left: -140px;} .reveal-modal.medium { width: 400px; margin-left: -240px;} .reveal-modal.large { width: 600px; margin-left: -340px;} .reveal-modal.xlarge { width: 800px; margin-left: -440px;}

.reveal-modal .close-reveal-modal { font-size: 22px; line-height: .5; position: absolute; top: 8px; right: 11px; color: #aaa; text-shadow: 0 -1px 1px rbga(0,0,0,.6); font-weight: bold; cursor: pointer; }