使用css3制作齿轮loading动画效果

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

#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;
    : -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); }
}