input.error {
    background-color: rgb(255, 190, 190);
}

div#preload {
    margin: auto;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #fff;
    z-index: 9999999;
    display: flex;
    align-content: center;
    justify-content: center;
}

.sk-folding-cube {
    top: 50%;
    left: 50%;
    margin-left: -25px;
    margin-top: -25px;
    width: 50px;
    height: 50px;
    position: absolute;
    -webkit-transform: rotateZ(45deg);
    transform: rotateZ(45deg);
}

.sk-folding-cube .sk-cube {
    float: left;
    width: 50%;
    height: 50%;
    position: relative;
    -webkit-transform: scale(1.1);
    -ms-transform: scale(1.1);
    transform: scale(1.1);
}

.sk-folding-cube .sk-cube2 {
    -webkit-transform: scale(1.1) rotateZ(90deg);
    transform: scale(1.1) rotateZ(90deg);
}


.sk-folding-cube .sk-cube4 {
    -webkit-transform: scale(1.1) rotateZ(270deg);
    transform: scale(1.1) rotateZ(270deg);
}

.sk-folding-cube .sk-cube3 {
    -webkit-transform: scale(1.1) rotateZ(180deg);
    transform: scale(1.1) rotateZ(180deg);
}

.sk-folding-cube .sk-cube:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    -webkit-animation: sk-foldCubeAngle 2.4s infinite linear both;
    animation: sk-foldCubeAngle 2.4s infinite linear both;
    -webkit-transform-origin: 100% 100%;
    -ms-transform-origin: 100% 100%;
    transform-origin: 100% 100%;
    background: #ffb606;
}

.sk-folding-cube .sk-cube2:before {
    -webkit-animation-delay: .3s;
    animation-delay: .3s;
}

.sk-folding-cube .sk-cube4:before {
    -webkit-animation-delay: .9s;
    animation-delay: .9s;
}

.sk-folding-cube .sk-cube3:before {
    -webkit-animation-delay: .6s;
    animation-delay: .6s;
}

@keyframes sk-foldCubeAngle{0%,10%{-webkit-transform:perspective(140px) rotateX(-180deg);transform:perspective(140px) rotateX(-180deg);opacity:0}25%,75%{-webkit-transform:perspective(140px) rotateX(0);transform:perspective(140px) rotateX(0);opacity:1}100%,90%{-webkit-transform:perspective(140px) rotateY(180deg);transform:perspective(140px) rotateY(180deg);opacity:0}}