.preloader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    z-index: 9;

    background: rgb(59,183,253);
    background: -moz-linear-gradient(40deg, rgba(59,183,253,1) 0%, rgba(176,43,254,1) 100%, rgba(176,43,254,1) 100%);
    background: -webkit-linear-gradient(40deg, rgba(59,183,253,1) 0%, rgba(176,43,254,1) 100%, rgba(176,43,254,1) 100%);
    background: linear-gradient(40deg, rgba(59,183,253,1) 0%, rgba(176,43,254,1) 100%, rgba(176,43,254,1) 100%);
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr="#3bb7fd",endColorstr="#b02bfe",GradientType=1);

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

.hide-preloader {
    animation: hidePreloader 1s;
}

@keyframes hidePreloader {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

.preloader-hidden {
    display: none;
}

.spinner {
    width: 55px;
    height: 55px;
    background-color: #ffffff;
    border-radius: 5px;
  
    margin: 100px auto;
    -webkit-animation: sk-rotateplane 1.2s infinite ease-in-out;
    animation: sk-rotateplane 1.2s infinite ease-in-out;
}
  
@-webkit-keyframes sk-rotateplane {
    0% { -webkit-transform: perspective(120px) }
    50% { -webkit-transform: perspective(120px) rotateY(180deg) }
    100% { -webkit-transform: perspective(120px) rotateY(180deg)  rotateX(180deg) }
}
  
@keyframes sk-rotateplane {
    0% { 
      transform: perspective(120px) rotateX(0deg) rotateY(0deg);
      -webkit-transform: perspective(120px) rotateX(0deg) rotateY(0deg) 
    } 50% { 
      transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg);
      -webkit-transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg) 
    } 100% { 
      transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
      -webkit-transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
    }
}