如何更改过渡顺序？

Question

转换不会在页面加载时显示。我需要改变方向，以便当用户向下滚动时，他们需要单击按钮以查看位于黑匣子内的内容。换句话说，黑盒子在用户告诉它之前不会显示。

按钮是朝向中间的三个灰点。

DEMO

<style> body, .container, .content-wrap {
    overflow: hidden;
    width: 100%;
    height: 100%;
}
.container {
    background: #fff;
}
.menu-wrap a {
    color: #b8b7ad;
}
.menu-wrap a:hover, .menu-wrap a:focus {
    color: #c94e50;
}
.content-wrap {
    overflow-y: scroll;
    -webkit-overflow-scrolling: touch;
}
.content {
    position: absolute;
    background: #fff;
    overflow-y: visible;
}
.content::before {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 10;
    width: 100%;
    height: 100%;
    background: none;
    content:'';
    opacity: 0;
    -webkit-transform: translate3d(100%, 0, 0);
    transform: translate3d(100%, 0, 0);
    -webkit-transition: opacity 0.4s, -webkit-transform 0s 0.4s;
    transition: opacity 0.4s, transform 0s 0.4s;
    -webkit-transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
    transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
}
/* Menu Button 1 */
 .menu-button {
    position: absolute;
    z-index: 1000;
    margin: 1em;
    padding: 0;
    width: 10px;
    height: 50px;
    border: none;
    text-indent: 2.5em;
    font-size: 1.5em;
    color: transparent;
    background: transparent;
    opacity: 1;
    top: 510px;
    left: 855px;
    -ms-transform: rotate(7deg);
    /* IE 9 */
    -webkit-transform: rotate(7deg);
    /* Chrome, Safari, Opera */
    transform: rotate(90deg);
}
.menu-button::before {
    position: absolute;
    top: 0.5em;
    right: 0.2em;
    bottom: 0.4em;
    left: -1px;
    background: linear-gradient(#929292 20%, transparent 20%, transparent 40%, #929292 40%, #929292 58%, transparent 0%, transparent 80%, #929292 80%);
    content:'';
}
.menu-button:hover {
    opacity: 1;
}
/* Close Button */
 .close-button {
    width: 50px;
    height: 50px;
    position: absolute;
    right: 1em;
    top: 1em;
    overflow: hidden;
    text-indent: 1em;
    font-size: 0.75em;
    border: none;
    background: transparent;
    color: transparent;
    opacity: 0;
}
.close-button::before, .close-button::after {
    content:'';
    position: absolute;
    width: 3px;
    height: 100%;
    top: 0;
    left: 50%;
    background: #bdc3c7;
}
.close-button::before {
    -webkit-transform: rotate(45deg);
    transform: rotate(45deg);
}
.close-button::after {
    -webkit-transform: rotate(-45deg);
    transform: rotate(-45deg);
}
/* Comments */
 .menu-wrap {
    position: absolute;
    z-index: 1000;
    width: 429.0500011444092px;
    height: 600.875px;
    right: 0;
    background: #0C0C0C;
    top: 6px;
    padding: 0;
    font-size: 1.15em;
    -webkit-transform: translate3d(500px, 0, 0);
    transform: translate3d(500px, 0, 0);
    -webkit-transition: -webkit-transform 0.4s;
    transition: transform 0.4s;
    -webkit-transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
    transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
}
.menu, .icon-list {
    height: 100%;
}
.icon-list {
    -webkit-transform: translate3d(0, 100%, 0);
    transform: translate3d(0, 100%, 0);
}
.icon-list a {
    display: block;
    padding: 0.8em;
    -webkit-transform: translate3d(0, 500px, 0);
    transform: translate3d(0, 500px, 0);
}
.icon-list, .icon-list a {
    -webkit-transition: -webkit-transform 0s 0.4s;
    transition: transform 0s 0.4s;
    -webkit-transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
    transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
}
.icon-list a:nth-child(2) {
    -webkit-transform: translate3d(0, 1000px, 0);
    transform: translate3d(0, 1000px, 0);
}
.icon-list a:nth-child(3) {
    -webkit-transform: translate3d(0, 1500px, 0);
    transform: translate3d(0, 1500px, 0);
}
.icon-list a:nth-child(4) {
    -webkit-transform: translate3d(0, 2000px, 0);
    transform: translate3d(0, 2000px, 0);
}
.icon-list a:nth-child(5) {
    -webkit-transform: translate3d(0, 2500px, 0);
    transform: translate3d(0, 2500px, 0);
}
.icon-list a:nth-child(6) {
    -webkit-transform: translate3d(0, 3000px, 0);
    transform: translate3d(0, 3000px, 0);
}
.icon-list a span {
    margin-left: 10px;
    font-weight: 700;
}
/* Shown menu */
 .show-menu .menu-wrap {
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
    -webkit-transition: -webkit-transform 0.8s;
    transition: transform 0.8s;
    -webkit-transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
    transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
}
.show-menu .icon-list, .show-menu .icon-list a {
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
    -webkit-transition: -webkit-transform 0.8s;
    transition: transform 0.8s;
    -webkit-transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
    transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
}
.show-menu .icon-list a {
    -webkit-transition-duration: 0.9s;
    transition-duration: 0.9s;
}
.show-menu .content::before {
    opacity: 1;
    -webkit-transition: opacity 0.8s;
    transition: opacity 0.8s;
    -webkit-transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
    transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
}
</style>