.context_center{
    width:1366px;   /*用于控制有效区域的宽度*/
    margin: 0px auto;
}
.ad{
    margin: 0px;
}

.body_bk_white{
    text-align: center;
    background-color: white;
}

.body_bk_deepgray{
    text-align: center;
    background-color: #3B4045;
}

.text_white{
    color: white; 
    font-weight:lighter; 
    font-family: 'Microsoft YaHei', sansserif;
}
.text_br_head{
    height:40px;
    line-height:35px;
}
.text_br{
    height:40px; 
    line-height:35px;
}
.text_br_50{
    height:50px; 
    line-height:45px;
}
.text_br_45{
    height:45px; 
    line-height:40px;
}
.text_br_40{
    height:40px; 
    line-height:35px;
}
.text_br_35{
    height:35px; 
    line-height:30px;
}
.text_br_30{
    height:30px; 
    line-height:30px;
}
.text_br_25{
    height:20px; 
    line-height:15px;
}
.text_black{
    color: black; 
    font-weight:lighter; 
    font-family: 'Microsoft YaHei', sansserif;
}
.textsize_50{
    font-size: 50px; 
}
.textsize_30{
    font-size: 30px; 
}
.textsize_25{
    font-size: 25px; 
}
.textsize_20{
    font-size: 20px; 
}
.textsize_15{
    font-size: 17px; 
}
.textdot{
    font-size: 25px;
    font-weight: bold;
}