.contentPlaceholder.box,
.contentPlaceholder.circle,
.contentPlaceholder.line,
.contentPlaceholder.header {
    color: #e8e8e8;
    background-color: #e8e8e8;
    border-color: #e8e8e8;
    opacity: 0.4;
    content: '';

    -webkit-animation: blink 2s infinite; /* Safari 4.0 - 8.0 */
    animation: blink 2s infinite;
    content: ' ';
    display: block;
    margin-bottom: 15px;
    max-width: 100%;
}

.contentPlaceholder.box {
    height: 100px;
}
.contentPlaceholder.line {
    height: 15px;
}
.contentPlaceholder.header {
    height: 25px;
}

.contentPlaceholder.circle {
    border-radius: 100%;
    -moz-border-radius: 100%;
    -webkit-border-radius: 100%;
    height: 100px;
}

@keyframes blink {
    0%   {opacity: 0.4;}
    50%  {opacity: 0.8;}
    100% {opacity: 0.4;}
}