m5-docs/docs/assets/css/loading.css

#loading {
    position:fixed; 
    left:0; 
    top:0; 
    width:100%; 
    height:100%; 
}
.demo3 {
    width: 4px;
    height: 4px;
    border-radius: 2px;
    background: #007bff;
    position: absolute;
    animation: demo3 linear 0.8s infinite;
    -webkit-animation: demo3 linear 0.8s infinite;
}
.demo3:nth-child(1){
    left: 24px;
    top: 2px;
    animation-delay:0s;
}
.demo3:nth-child(2){
    left: 40px;
    top: 8px;
    animation-delay:0.1s;
}
.demo3:nth-child(3){
    left: 47px;
    top: 24px;
    animation-delay:0.1s;
}
.demo3:nth-child(4){
    left: 40px;
    top: 40px;
    animation-delay:0.2s;
}
.demo3:nth-child(5){
    left: 24px;
    top: 47px;
    animation-delay:0.4s;
}
.demo3:nth-child(6){
    left: 8px;
    top: 40px;
    animation-delay:0.5s;
}
.demo3:nth-child(7){
    left: 2px;
    top: 24px;
    animation-delay:0.6s;
}
.demo3:nth-child(8){
    left: 8px;
    top: 8px;
    animation-delay:0.7s;
}

@keyframes demo3 
{
    0%,40%,100% {transform: scale(1);}
    20% {transform: scale(3);}
}
@-webkit-keyframes demo3 
{
    0%,40%,100% {transform: scale(1);}
    20% {transform: scale(3);}
}


.loading-flex {
    position:absolute;
    top:45%;
    left:50%;
}


@media screen and (max-width: 768px){
    .loading-flex {
        position:absolute;
        top:45%;
        left:45%;
    }
}