页面布局中的模块内容有不少是带有按钮的，譬如是了解更多的按钮、表单提交的按钮等。按钮有引导用户点击、激发用户点击行为等的作用，例如下单购买商品或者跳转链接或者展开更多内容以达到了解更多的详情的目的。与页面风格协调的按钮设计可以增加页面的美观效果和更易于吸引客户的注意力，为了提高用户对关于页面操作的体验度，还可以在按钮的制作中加入一些动态效果。例如，当鼠标经过按钮的时候，可以适当添加一些动态效果或者加入背景的填充，下面是可以在日常工作中需要用css3制作鼠标经过页面按钮能用到的动画效果。
如下图按钮效果一，鼠标经过会有微微下陷的效果：

Html:
<div class="btn">
<a href="">
<span>了解更多</span>
</a>
</div>
CSS:
.i-title .btn{
text-align: center;
margin-top: 50px;
}
.i-title .btn a{
background: none;
    border: none;
    display: inline-block;
    text-align: center;
    font-size: 14px;
    color: #FFFFFF;
    position: relative;
    padding: 17px 35px;
    overflow: hidden;
    font-weight: 400;
    cursor: pointer;
    -moz-transition: all 400ms ease-in-out;
    -o-transition: all 400ms ease-in-out;
    -webkit-transition: all 400ms ease-in-out;
    transition: all 400ms ease-in-out;
}
.i-title .btn a:before{
content: "";
    position: absolute;
    z-index: 50;
    -moz-transition: all 1.4s ease;
    -o-transition: all 1.4s ease;
    -webkit-transition: all 1.4s ease;
    transition: all 1.4s ease;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(27,57,82,0.3);
    -moz-transform: scale(1.02, 1.02);
    -ms-transform: scale(1.02, 1.02);
    -webkit-transform: scale(1.02, 1.02);
    transform: scale(1.02, 1.02);
    -moz-transition: all 400ms ease-in-out;
    -o-transition: all 400ms ease-in-out;
    -webkit-transition: all 400ms ease-in-out;
    transition: all 400ms ease-in-out;
}
.i-title .btn a:after{
content: "";
    display: block;
    position: absolute;
    top: 2px;
    left: 2px;
    right: 2px;
    bottom: 2px;
    background-color: #1b3952;
    z-index: 100;
    -moz-transition: all 400ms ease-in-out;
    -o-transition: all 400ms ease-in-out;
    -webkit-transition: all 400ms ease-in-out;
    transition: all 400ms ease-in-out;
}
.i-title .btn a span{
position: relative;
    z-index: 300;
    -moz-transition: all 400ms ease-in-out;
    -o-transition: all 400ms ease-in-out;
    -webkit-transition: all 400ms ease-in-out;
    transition: all 400ms ease-in-out;
    padding-right: 30px;
    background: url(../images/img16.png) center right no-repeat;
}
.i-title .btn a:hover span{
background: url(../images/img17.png) center right no-repeat;
-moz-transition: all 400ms ease-in-out;
    -o-transition: all 400ms ease-in-out;
    -webkit-transition: all 400ms ease-in-out;
    transition: all 400ms ease-in-out;
}
 
如下图按钮效果二，鼠标经过会有背景填充的动画效果：

Html:
<div class="xbtn">
<a href="">
了解更多
<span></span>
</a>
</div>
Css:
.xbtn a{
position: relative;
    display: block;
margin: 20px auto;
text-align: center;    
width: 150px;
    height: 50px;
    line-height: 50px;
    max-width: 250px;
    color: #FFFFFF;
    text-transform: uppercase;
    overflow: hidden;
    border: 1px solid currentColor;
}
.xbtn a:hover{
color: #1b3952;
}
.xbtn a span{
position: absolute;
    display: block;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: #FFFFFF;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    -webkit-transition: width 0.4s, height 0.4s;
    transition: width 0.4s, height 0.4s;
    z-index: -1;
}
.xbtn a:hover span {
    width: 320px;
    height: 320px;
}