.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    font-size: 0;
    text-align: center;
    -webkit-transform: translateZ(1px);
    transform: translateZ(1px);
    -webkit-backface-visibility: hidden;
}
.preloader:before {
    content: "";
    display: inline-block;
    vertical-align: middle;
    height: 100%;
}
.preloader_hidden .preloader__cover_top {
    -webkit-transform: translateY(-100%);
    /* transform: translateY(-100%); */
}
.preloader__cover_top {
    top: 0;
}

.preloader_hidden .preloader__cover_bottom {
    -webkit-transform: translateY(100%);
    transform: translateY(100%);
}
.preloader__cover_bottom {
    bottom: 0;
}
.preloader__cover {
    position: absolute;
    left: 0;
    width: 100%;
    height: 50%;
    background: #fff;
    -webkit-transition: -webkit-transform 1.7s ease;
    transition: -webkit-transform 1.7s ease;
    transition: transform 1.7s ease;
    transition: transform 1.7s ease, -webkit-transform 1.7s ease;
}
.preloader_hidden .preloader__content {
    opacity: 0;
}
.preloader__logo-cover {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    -webkit-transition: -webkit-transform 2s ease;
    transition: -webkit-transform 2s ease;
    transition: transform 2s ease;
    transition: transform 2s ease, -webkit-transform 2s ease;
}
.preloader__content {
    display: inline-block;
    vertical-align: middle;
    position: relative;
}
.preloader__content img {
    width: 10%;
}
.body_overflow_hidden{
    position: fixed;
    overflow: hidden;
    width: 100%;
    height: 100%;
}
.body {
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    -webkit-transition: opacity 1.5s cubic-bezier(0.19, 1, 0.22, 1), -webkit-transform 1.5s cubic-bezier(0.19, 1, 0.22, 1);
    transition: opacity 1.5s cubic-bezier(0.19, 1, 0.22, 1), -webkit-transform 1.5s cubic-bezier(0.19, 1, 0.22, 1);
    transition: transform 1.5s cubic-bezier(0.19, 1, 0.22, 1), opacity 1.5s cubic-bezier(0.19, 1, 0.22, 1);
    transition: transform 1.5s cubic-bezier(0.19, 1, 0.22, 1), opacity 1.5s cubic-bezier(0.19, 1, 0.22, 1), -webkit-transform 1.5s cubic-bezier(0.19, 1, 0.22, 1);
    
}
.nav-header {
    webkit-transition: opacity .5s ease, -webkit-transform .5s ease;
    transition: opacity .5s ease, -webkit-transform .5s ease;
    transition: transform .5s ease, opacity .5s ease;
    transition: transform .5s ease, opacity .5s ease, -webkit-transform .5s ease;
    transform: translateY(-100%);
}