a{
    text-decoration: none;
    display: block;
}
img{
    vertical-align: middle;
    border: none;
}
.fl{
    float: left;
}
.fr{
    float:right;
}
.ma{
    margin: auto;
}
.mt{
    margin-top: 20px;
}
.mr{
    margin-right: 20px;
}
.ml{
    margin-left: 18px;
}
.mb{
    margin-bottom: 20px;
}
.pr{
    position: relative;
}
.pa{
    position: absolute;
}
.dis_bl{
    display: block;
}
.fw{
    font-weight: bold;
}
.ft_12{
    font-size: 12px;
}
.ft_14{
    font-size: 14px;
}
.ft_16{
    font-size: 16px;
}
.ft_18{
    font-size: 18px;
}
.ft_20{
    font-size: 20px;
}
ul{
    list-style: none;
    margin: 0px;
    padding: 0px;
}
.hover:hover{
    color: #255399;
}