CSS透明颜色样式 color:transparent;
鼠标移动上去边手 cursor: pointer;
清除bootstrap默认元素选中阴影
button:focus {
outline: none;
}
强制单词换行:word-break:break-all;
清除a标签下划线:text-decoration: none;
清楚浮动.home_buttonBar:after{
clear: both;
float: none;
content: '';
display: block;
}