超酷的 CSS3 loading 预加载动画特效

给大家介绍一款超酷CSS3 loading预加载动画特效。

该loading特效共有4种不同的效果，分别通过不同的CSS3 keyframes帧动画来完成。

HTML结构

4种loading预加载动画的HTML结构分别如下：

<!-- 效果一 -->
<div class="spinner-box">
<div class="circle-border">
<div class="circle-core"></div>
</div>
</div>

<!-- 效果二 -->
<div class="spinner-box">
<div class="configure-border-1">
<div class="configure-core"></div>
</div>
<div class="configure-border-2">
<div class="configure-core"></div>
</div>
</div>

<!-- 效果三 -->
<div class="spinner-box">
<div class="pulse-container">
<div class="pulse-bubble pulse-bubble-1"></div>
<div class="pulse-bubble pulse-bubble-2"></div>
<div class="pulse-bubble pulse-bubble-3"></div>
</div>
</div>

<!-- 效果四 -->
<div class="spinner-box">
<div class="solar-system">
<div class="earth-orbit orbit">
<div class="planet earth"></div>
<div class="venus-orbit orbit">
<div class="planet venus"></div>
<div class="mercury-orbit orbit">
<div class="planet mercury"></div>
<div class="sun"></div>
</div>
</div>
</div>
</div>
</div>

CSS样式

然后分别为它们添加下面的CSS样式。

/* KEYFRAMES */

@keyframes spin {
from {
transform: rotate(0);
}
to{
transform: rotate(359deg);
}
}

@keyframes configure-clockwise {
0% {
transform: rotate(0);
}
25% {
transform: rotate(90deg);
}
50% {
transform: rotate(180deg);
}
75% {
transform: rotate(270deg);
}
100% {
transform: rotate(359deg);
}
}

@keyframes configure-xclockwise {
0% {
transform: rotate(45deg);
}
25% {
transform: rotate(-45deg);
}
50% {
transform: rotate(-135deg);
}
75% {
transform: rotate(-215deg);
}
100% {
transform: rotate(-305deg);
}
}

@keyframes pulse {
from {
opacity: 1;
transform: scale(1);
}
to {
opacity: .25;
transform: scale(.75);
}
}

/* GRID STYLING */

* {
box-sizing: border-box;
}

body {
min-height: 100vh;
background-color: #37474f;
display: flex;
justify-content: space-between;
flex-wrap: wrap;
align-items: flex-start;
}

.spinner-box {
width: 300px;
height: 300px;
display: flex;
justify-content: center;
align-items: center;
background-color: transparent;
}

/* SPINNING CIRCLE */

.circle-border {
width: 150px;
height: 150px;
padding: 3px;
display: flex;
justify-content: center;
align-items: center;
border-radius: 50%;
background: rgb(63,249,220);
background: linear-gradient(0deg, rgba(63,249,220,0.1) 33%, rgba(63,249,220,1) 100%);
animation: spin .8s linear 0s infinite;
}

.circle-core {
width: 100%;
height: 100%;
background-color: #37474f;
border-radius: 50%;
}

/* X-ROTATING BOXES */

.configure-border-1 {
width: 115px;
height: 115px;
padding: 3px;
position: absolute;
display: flex;
justify-content: center;
align-items: center;
background: #ffab91;
animation: configure-clockwise 3s ease-in-out 0s infinite alternate;
}

.configure-border-2 {
width: 115px;
height: 115px;
padding: 3px;
left: -115px;
display: flex;
justify-content: center;
align-items: center;
background: rgb(63,249,220);
transform: rotate(45deg);
animation: configure-xclockwise 3s ease-in-out 0s infinite alternate;
}

.configure-core {
width: 100%;
height: 100%;
background-color: #37474f;
}

/* PULSE BUBBLES */

.pulse-container {
width: 120px;
display: flex;
justify-content: space-between;
align-items: center;
}

.pulse-bubble {
width: 20px;
height: 20px;
border-radius: 50%;
background-color: #3ff9dc;
}

.pulse-bubble-1 {
animation: pulse .4s ease 0s infinite alternate;
}
.pulse-bubble-2 {
animation: pulse .4s ease .2s infinite alternate;
}
.pulse-bubble-3 {
animation: pulse .4s ease .4s infinite alternate;
}

/* SOLAR SYSTEM */

.solar-system {
width: 250px;
height: 250px;
display: flex;
justify-content: center;
align-items: center;
}

.orbit {
position: relative;
display: flex;
justify-content: center;
align-items: center;
border: 1px solid #ffffffa5;
border-radius: 50%;
}

.earth-orbit {
width: 165px;
height: 165px;
-webkit-animation: spin 12s linear 0s infinite;
}

.venus-orbit {
width: 120px;
height: 120px;
-webkit-animation: spin 7.4s linear 0s infinite;
}

.mercury-orbit {
width: 90px;
height: 90px;
-webkit-animation: spin 3s linear 0s infinite;
}

.planet {
position: absolute;
top: -5px;
width: 10px;
height: 10px;
border-radius: 50%;
background-color: #3ff9dc;
}

.sun {
width: 35px;
height: 35px;
border-radius: 50%;
background-color: #ffab91;
}