css3各个动画效果（使用css3制作齿轮loading动画效果）

<li class="container">
    <li class="row">
        <li class="col-md-12">
            <li id="loader-wrapper">
                <li id="loader1" class="fa fa-cog loader"></li>
                <li id="loader2" class="fa fa-cog loader"></li>
                <li id="loader3" class="fa fa-cog loader"></li>
            </li>
        </li>
    </li>
</li>

#loader-wrapper {
    width: 60px;
    height: 60px;
    margin: auto;
    position: relative;
}
.loader{ position: absolute; }
#loader1{
    color: #3A4652;
    font-size: 35px;
    text-align: center;
    width: 35px;
    height: 35px;
    top: -20px;
    left: 3px;
    animation: animate-1 1s infinite linear;
}
#loader2{
    color: #d72f2b;
    font-size: 50px;
    text-align: center;
    height: 50px;
    width: 50px;
    right: -12px;
    animation: animate-2 1s infinite linear;
}
#loader3{
    color: #3A4652;
    font-size: 35px;
    text-align: center;
    width: 35px;
    height: 35px;
    bottom: -10px;
    left: 3px;
    animation: animate-3 1s infinite linear;
}
@keyframes animate-1{
    100% { transform: rotate(-180deg); }
}
@keyframes animate-2{
    100% { transform: rotate(180deg); }
}
@keyframes animate-3{
    100% { transform: rotate(-180deg); }
}