qt5base-lts/examples/webkit/webkit-guide/css/anim_pulse.css

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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 }
}