html, body {
    height: 100%;
}

body {
    align-items: center;
    display: flex;
    justify-content: center;
}

.loader  {
    position: fixed;
    background-color: #1D1F20;
    animation: rotate 1s infinite;
    height: 50px;
    width: 50px;
    transition: opacity 0.75s, visibility 0.75s;
    -webkit-transition: opacity 0.75s, visibility 0.75s;
    -moz-transition: opacity 0.75s, visibility 0.75s;
    -ms-transition: opacity 0.75s, visibility 0.75s;
    -o-transition: opacity 0.75s, visibility 0.75s;
}

.loader-hidden {
    opacity: 0;
    visibility: hidden;
}

.loader:before,
.loader:after {   
    border-radius: 50%;
    content: '';
    display: block;
    height: 20px;  
    width: 20px;
}

.loader:before {
    animation: ball1 1s infinite;  
    background-color: #cb2025;
    box-shadow: 30px 0 0 #f8b334;
    margin-bottom: 10px;
}
.loader:after {
    animation: ball2 1s infinite; 
    background-color: #00a096;
    box-shadow: 30px 0 0 #97bf0d;
}

@keyframes rotate {
    0% { 
    -webkit-transform: rotate(0deg) scale(0.8); 
    -moz-transform: rotate(0deg) scale(0.8);
}
    50% { 
    -webkit-transform: rotate(360deg) scale(1.2); 
    -moz-transform: rotate(360deg) scale(1.2);
}
    100% { 
    -webkit-transform: rotate(720deg) scale(0.8); 
    -moz-transform: rotate(720deg) scale(0.8);
    }
}

@keyframes ball1 {
    0% {
    box-shadow: 30px 0 0 #f8b334;
    }
    50% {
    box-shadow: 0 0 0 #f8b334;
    margin-bottom: 0;
    -webkit-transform: translate(15px,15px);
    -moz-transform: translate(15px, 15px);
    }
    100% {
    box-shadow: 30px 0 0 #f8b334;
    margin-bottom: 10px;
    }
}

@keyframes ball2 {
    0% {
    box-shadow: 30px 0 0 #97bf0d;
    }
    50% {
    box-shadow: 0 0 0 #97bf0d;
    margin-top: -20px;
    -webkit-transform: translate(15px,15px);
    -moz-transform: translate(15px, 15px);
    }
    100% {
    box-shadow: 30px 0 0 #97bf0d;
    margin-top: 0;
    }
}