anim_pulse.css Example File

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 body {
     background          : #aaaaaa;
     font-family         : sans-serif;
 }

 h1,h2,h3,h4 {
     text-align          : center;
 }

 section {
     position            : absolute;
     top                 : 0;
     left                : 0;
     right               : 0;
     bottom              : 0;
 }

 article {
     background          : #ffffff;
     border-radius       : 1.0em;
     padding             : 1.0em;
     margin              : 1em;
     min-height          : 50%;
 }

 .force {
     padding-left        : 100%
 }

 nav {
     text-align          : justify;
 }

 nav > a {
     background-size     : contain;
     background-repeat   : no-repeat;
 }

 nav > a {
     display             : inline-block;
     width               : 2em;
     height              : 2em;
 }

 nav > a:nth-of-type(1) { background-image : url(../img/ic_fe_032.png); }
 nav > a:nth-of-type(2) { background-image : url(../img/ic_ni_032.png); }
 nav > a:nth-of-type(3) { background-image : url(../img/ic_he_032.png); }
 nav > a:nth-of-type(4) { background-image : url(../img/ic_na_032.png); }
 nav > a:nth-of-type(5) { background-image : url(../img/ic_zn_032.png); }
 nav > a:nth-of-type(6) { background-image : url(../img/ic_o_032.png); }

 h1,h2,h3 { margin-top : 0; }

 nav > a:target { -webkit-animation : pulse 1s infinite; }

 @-webkit-keyframes pulse {
     0% { opacity    : 1.0 }
     50% { opacity   : 0.7 }
 }