有用的css代码段

.clearfix:before,
.clearfix:after{
display: table;
content: " ";
}
.clearfix:after{
clear: both;
}

overflow: hidden;
white-space: nowrap;
text-overflow: ellipsis;

position: absolute;
left: 50%;
top: 50%;
-webkit-transform: translate(-50%,-50%);
transform: translate(-50%,-50%);

input,button,select,textarea{
outline: none;
}
input{
border: 0;
}
textarea{
resize: none;
}