跳动的心

不用图片，使用CSS3做出一个跳动的心。

HTML：

<span style="color: #0000ff;">　　　　<span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="box"</span><span style="color: #0000ff;">></span>
            <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="left"</span><span style="color: #0000ff;">></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
            <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="right"</span><span style="color: #0000ff;">></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>
        <span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span></span></span></span>

首先两个div浮动，左上和右上角变圆：

<span style="color: #800000;">            .box</span>{<span style="color: #ff0000;">
            margin</span>:<span style="color: #0000ff;"> 100px</span>;
            }<span style="color: #800000;">
            .left,.right</span>{<span style="color: #ff0000;">
                float</span>:<span style="color: #0000ff;"> left</span>;
            }<span style="color: #800000;">
            .box div</span>{<span style="color: #ff0000;">
                height</span>:<span style="color: #0000ff;">160px</span>;<span style="color: #ff0000;">
                width</span>:<span style="color: #0000ff;"> 100px</span>;<span style="color: #ff0000;">
                border-radius</span>:<span style="color: #0000ff;"> 50px 50px 0 0</span>;<span style="color: #ff0000;">
                background</span>:<span style="color: #0000ff;"> red</span>;
            }                        

变成：

然后让两个div旋转一下，左边的以右下角为旋转点正时针转45度，右边的以左下角为旋转点逆时针转45度，加点阴影：

<span style="color: #800000;">.left</span>{<span style="color: #ff0000;">        
                transform-origin</span>:<span style="color: #0000ff;"> 100% 100%</span>;<span style="color: #ff0000;">
                transform</span>:<span style="color: #0000ff;"> rotate(45deg)</span>;<span style="color: #ff0000;">
                box-shadow</span>:<span style="color: #0000ff;"> 8px 10px 10px #888888</span>;       
        }<span style="color: #800000;">
.right</span>{<span style="color: #ff0000;">                
                transform-origin</span>:<span style="color: #0000ff;"> 0% 100%</span>;<span style="color: #ff0000;">
                transform</span>:<span style="color: #0000ff;"> rotate(-45deg)</span>;<span style="color: #ff0000;">
                box-shadow</span>:<span style="color: #0000ff;"> -10px -1px 10px #888888</span>;     
            }<br><br>

心形出来了：

让心动起来，加点动画吧：

<span style="color: #800000;">　　　　.box div</span>{<span style="color: #ff0000;">
                animation</span>:<span style="color: #0000ff;"> lb  1s  cubic-bezier(0.3,0.4,0.3,1) 0s infinite</span>;<span style="color: #ff0000;">
                border</span>:<span style="color: #0000ff;"> 0px solid red</span>;/*这个不能少*/
   　　　　　　 }<span style="color: #800000;">
　　　　@keyframes lb</span>{<span style="color: #ff0000;">
                0%{
                    border</span>:<span style="color: #0000ff;"> 10px solid red</span>;<span style="color: #ff0000;">
                    border-radius</span>:<span style="color: #0000ff;"> 58px 58px 0 0</span>;
                }<span style="color: #800000;">
                50%</span>{<span style="color: #ff0000;">
                    border</span>:<span style="color: #0000ff;"> 20px solid red</span>;<span style="color: #ff0000;">
                    border-radius</span>:<span style="color: #0000ff;"> 66px 66px 0 0</span>;
                }<span style="color: #800000;">
                100%</span>{<span style="color: #ff0000;">
                    border</span>:<span style="color: #0000ff;">0px solid red</span>;<span style="color: #ff0000;">
                    border-radius</span>:<span style="color: #0000ff;"> 50px 50px 0 0</span>;
                }<span style="color: #800000;">
            }</span>

好了，一颗跳动的心就完成了。

完整CSS：

<span style="color: #800000;">        <style>
            .box</style></span>{<span style="color: #ff0000;">
                margin</span>:<span style="color: #0000ff;"> 100px</span>;
            }<span style="color: #800000;">
            .left,.right</span>{<span style="color: #ff0000;">
                float</span>:<span style="color: #0000ff;"> left</span>;
            }<span style="color: #800000;">
            .box div</span>{<span style="color: #ff0000;">
                height</span>:<span style="color: #0000ff;">160px</span>;<span style="color: #ff0000;">
                width</span>:<span style="color: #0000ff;"> 100px</span>;<span style="color: #ff0000;">
                border-radius</span>:<span style="color: #0000ff;"> 50px 50px 0 0</span>;<span style="color: #ff0000;">
                background</span>:<span style="color: #0000ff;"> red</span>;<span style="color: #ff0000;">
                animation</span>:<span style="color: #0000ff;"> lb  1s  cubic-bezier(0.3,0.4,0.3,1) 0s infinite</span>;<span style="color: #ff0000;">
                border</span>:<span style="color: #0000ff;"> 0px solid red</span>;
            }<span style="color: #800000;">
            .left</span>{<span style="color: #ff0000;">        
                transform-origin</span>:<span style="color: #0000ff;"> 100% 100%</span>;<span style="color: #ff0000;">
                transform</span>:<span style="color: #0000ff;"> rotate(45deg)</span>;<span style="color: #ff0000;">
                box-shadow</span>:<span style="color: #0000ff;"> 8px 10px 10px #888888</span>;       
            }<span style="color: #800000;">
            @keyframes lb</span>{<span style="color: #ff0000;">
                0%{
                    border</span>:<span style="color: #0000ff;"> 10px solid red</span>;<span style="color: #ff0000;">
                    border-radius</span>:<span style="color: #0000ff;"> 58px 58px 0 0</span>;
                }<span style="color: #800000;">
                50%</span>{<span style="color: #ff0000;">
                    border</span>:<span style="color: #0000ff;"> 20px solid red</span>;<span style="color: #ff0000;">
                    border-radius</span>:<span style="color: #0000ff;"> 66px 66px 0 0</span>;
                }<span style="color: #800000;">
                100%</span>{<span style="color: #ff0000;">
                    border</span>:<span style="color: #0000ff;">0px solid red</span>;<span style="color: #ff0000;">
                    border-radius</span>:<span style="color: #0000ff;"> 50px 50px 0 0</span>;
                }<span style="color: #800000;">
            }
            .right</span>{<span style="color: #ff0000;">                
                transform-origin</span>:<span style="color: #0000ff;"> 0% 100%</span>;<span style="color: #ff0000;">
                transform</span>:<span style="color: #0000ff;"> rotate(-45deg)</span>;<span style="color: #ff0000;">
                box-shadow</span>:<span style="color: #0000ff;"> -10px -1px 10px #888888</span>;     
            }<span style="color: #800000;">
            </span>