#loading-upload {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0,0,0,.8);
z-index: 100;
display: none;
}
#loading-upload .content {
width: 100%;
height: 100%;
}
#loading-upload img {
position: absolute;
float: left;
width: 50px;
filter: invert();
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
animation: loading;
animation-iteration-count: infinite;
animation-duration: 3s;
animation-timing-function: linear;
}

@keyframes loading {
0% {transform: translate(-50%,-50%) rotate(0deg);}
100% {transform: translate(-50%,-50%) rotate(360deg);}
}