web前端小案例-纯css书架装载机

<div class="bookshelf_wrapper">
<ul class="books_list">
<li class="book_item first"></li>
<li class="book_item second"></li>
<li class="book_item third"></li>
<li class="book_item fourth"></li>
<li class="book_item fifth"></li>
<li class="book_item sixth"></li>
</ul>
<div class="shelf"></div>
</div>

<style>
body {
background-color: #1e6cc7;
width: 100%;
height: 100vh;
margin: 0;
}

.bookshelf_wrapper {
position: relative;
top: 60%;
left: 50%;
-webkit-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
}

.books_list {
margin: 0 auto;
width: 300px;
padding: 0;
}

.book_item {
position: absolute;
top: -120px;
box-sizing: border-box;
list-style: none;
width: 40px;
height: 120px;
opacity: 0;
background-color: #1e6cc7;
border: 5px solid white;
-webkit-transform-origin: bottom left;
transform-origin: bottom left;
-webkit-transform: translateX(300px);
transform: translateX(300px);
-webkit-animation: travel 2500ms linear infinite;
animation: travel 2500ms linear infinite;
}
.book_item.first {
top: -140px;
height: 140px;
}
.book_item.first:before, .book_item.first:after {
content: '';
position: absolute;
top: 10px;
left: 0;
width: 100%;
height: 5px;
background-color: white;
}
.book_item.first:after {
top: initial;
bottom: 10px;
}
.book_item.second:before, .book_item.second:after, .book_item.fifth:before, .book_item.fifth:after {
box-sizing: border-box;
content: '';
position: absolute;
top: 10px;
left: 0;
width: 100%;
height: 17.5px;
border-top: 5px solid white;
border-bottom: 5px solid white;
}
.book_item.second:after, .book_item.fifth:after {
top: initial;
bottom: 10px;
}
.book_item.third:before, .book_item.third:after {
box-sizing: border-box;
content: '';
position: absolute;
top: 10px;
left: 9px;
width: 12px;
height: 12px;
border-radius: 50%;
border: 5px solid white;
}
.book_item.third:after {
top: initial;
bottom: 10px;
}
.book_item.fourth {
top: -130px;
height: 130px;
}
.book_item.fourth:before {
box-sizing: border-box;
content: '';
position: absolute;
top: 46px;
left: 0;
width: 100%;
height: 17.5px;
border-top: 5px solid white;
border-bottom: 5px solid white;
}
.book_item.fifth {
top: -100px;
height: 100px;
}
.book_item.sixth {
top: -140px;
height: 140px;
}
.book_item.sixth:before {
box-sizing: border-box;
content: '';
position: absolute;
bottom: 31px;
left: 0px;
width: 100%;
height: 5px;
background-color: white;
}
.book_item.sixth:after {
box-sizing: border-box;
content: '';
position: absolute;
bottom: 10px;
left: 9px;
width: 12px;
height: 12px;
border-radius: 50%;
border: 5px solid white;
}
.book_item:nth-child(2) {
-webkit-animation-delay: 416.66667ms;
animation-delay: 416.66667ms;
}
.book_item:nth-child(3) {
-webkit-animation-delay: 833.33333ms;
animation-delay: 833.33333ms;
}
.book_item:nth-child(4) {
-webkit-animation-delay: 1250ms;
animation-delay: 1250ms;
}
.book_item:nth-child(5) {
-webkit-animation-delay: 1666.66667ms;
animation-delay: 1666.66667ms;
}
.book_item:nth-child(6) {
-webkit-animation-delay: 2083.33333ms;
animation-delay: 2083.33333ms;
}

.shelf {
width: 300px;
height: 5px;
margin: 0 auto;
background-color: white;
position: relative;
}
.shelf:before, .shelf:after {
content: '';
position: absolute;
width: 100%;
height: 100%;
background: #1e6cc7;
background-image: -webkit-radial-gradient(rgba(255, 255, 255, 0.5) 30%, rgba(0, 0, 0, 0) 0%);
background-image: radial-gradient(rgba(255, 255, 255, 0.5) 30%, rgba(0, 0, 0, 0) 0%);
background-size: 10px 10px;
background-position: 0 -2.5px;
top: 200%;
left: 5%;
-webkit-animation: move 250ms linear infinite;
animation: move 250ms linear infinite;
}
.shelf:after {
top: 400%;
left: 7.5%;
}

@-webkit-keyframes move {
from {
background-position-x: 0;
}
to {
background-position-x: 10px;
}
}

@keyframes move {
from {
background-position-x: 0;
}
to {
background-position-x: 10px;
}
}
@-webkit-keyframes travel {
0% {
opacity: 0;
-webkit-transform: translateX(300px) rotateZ(0deg) scaleY(1);
transform: translateX(300px) rotateZ(0deg) scaleY(1);
}
6.5% {
-webkit-transform: translateX(279.5px) rotateZ(0deg) scaleY(1.1);
transform: translateX(279.5px) rotateZ(0deg) scaleY(1.1);
}
8.8% {
-webkit-transform: translateX(273.6px) rotateZ(0deg) scaleY(1);
transform: translateX(273.6px) rotateZ(0deg) scaleY(1);
}
10% {
opacity: 1;
-webkit-transform: translateX(270px) rotateZ(0deg);
transform: translateX(270px) rotateZ(0deg);
}
17.6% {
-webkit-transform: translateX(247.2px) rotateZ(-30deg);
transform: translateX(247.2px) rotateZ(-30deg);
}
45% {
-webkit-transform: translateX(165px) rotateZ(-30deg);
transform: translateX(165px) rotateZ(-30deg);
}
49.5% {
-webkit-transform: translateX(151.5px) rotateZ(-45deg);
transform: translateX(151.5px) rotateZ(-45deg);
}
61.5% {
-webkit-transform: translateX(115.5px) rotateZ(-45deg);
transform: translateX(115.5px) rotateZ(-45deg);
}
67% {
-webkit-transform: translateX(99px) rotateZ(-60deg);
transform: translateX(99px) rotateZ(-60deg);
}
76% {
-webkit-transform: translateX(72px) rotateZ(-60deg);
transform: translateX(72px) rotateZ(-60deg);
}
83.5% {
opacity: 1;
-webkit-transform: translateX(49.5px) rotateZ(-90deg);
transform: translateX(49.5px) rotateZ(-90deg);
}
90% {
opacity: 0;
}
100% {
opacity: 0;
-webkit-transform: translateX(0px) rotateZ(-90deg);
transform: translateX(0px) rotateZ(-90deg);
}
}
@keyframes travel {
0% {
opacity: 0;
-webkit-transform: translateX(300px) rotateZ(0deg) scaleY(1);
transform: translateX(300px) rotateZ(0deg) scaleY(1);
}
6.5% {
-webkit-transform: translateX(279.5px) rotateZ(0deg) scaleY(1.1);
transform: translateX(279.5px) rotateZ(0deg) scaleY(1.1);
}
8.8% {
-webkit-transform: translateX(273.6px) rotateZ(0deg) scaleY(1);
transform: translateX(273.6px) rotateZ(0deg) scaleY(1);
}
10% {
opacity: 1;
-webkit-transform: translateX(270px) rotateZ(0deg);
transform: translateX(270px) rotateZ(0deg);
}
17.6% {
-webkit-transform: translateX(247.2px) rotateZ(-30deg);
transform: translateX(247.2px) rotateZ(-30deg);
}
45% {
-webkit-transform: translateX(165px) rotateZ(-30deg);
transform: translateX(165px) rotateZ(-30deg);
}
49.5% {
-webkit-transform: translateX(151.5px) rotateZ(-45deg);
transform: translateX(151.5px) rotateZ(-45deg);
}
61.5% {
-webkit-transform: translateX(115.5px) rotateZ(-45deg);
transform: translateX(115.5px) rotateZ(-45deg);
}
67% {
-webkit-transform: translateX(99px) rotateZ(-60deg);
transform: translateX(99px) rotateZ(-60deg);
}
76% {
-webkit-transform: translateX(72px) rotateZ(-60deg);
transform: translateX(72px) rotateZ(-60deg);
}
83.5% {
opacity: 1;
-webkit-transform: translateX(49.5px) rotateZ(-90deg);
transform: translateX(49.5px) rotateZ(-90deg);
}
90% {
opacity: 0;
}
100% {
opacity: 0;
-webkit-transform: translateX(0px) rotateZ(-90deg);
transform: translateX(0px) rotateZ(-90deg);
}
}

</style>