.header_ding{
    position: relative;
    /* top:-20px; */
    margin:auto;
    /* width:1930px; */
    background:#ffffff;
    border-bottom: 1px solid #e0e0e0;
    box-shadow: 0 5px 10px #e0e0e0;
}
.header_ding1{
    margin:auto;
    position:relative;
    width:1170px;
    padding-top:20px;
    padding-bottom:20px;
}
.categories{
    background:#154F97;
    width:258px;
    height:45px;
    color:#ffffff;
    /*text-align: center;*/
    line-height: 45px;
    font-size:20px;
}
.Electric_drill{
    width:258px;
    height:45px;
    line-height: 45px;
    border-bottom: 1px solid #154F97;
}
.Electric_drill a{
    color:#7A7A7A;
    font-size: 15px;
}
.Screwdriver{
    width:258px;
    height:45px;
    line-height: 45px;
    border-bottom: 1px solid #7A7A7A;
}
.Hand_drill{
    width:258px;
    line-height: 36px;
    border-bottom: 1px solid #7A7A7A;
}
.Hand_drill a{
    color:#373737;
    font-size:14px;
}
.Angle_Grinder{
    width:258px;
    height:45px;
    line-height: 45px;
    border-bottom: 1px solid #154F97;
}
.Angle_Grinder a{
    color:#7A7A7A;
    font-size: 15px;
}
.Jigsaw{
    width:258px;
    height:45px;
    line-height: 45px;
    border-bottom: 1px solid #7A7A7A;
}
.Jigsaw a{
    color:#7A7A7A;
}

.Electric_circular_saw{
    width:258px;
    height:45px;
    line-height: 45px;
    border-bottom: 1px solid #7A7A7A;
}
.Electric_circular_saw a{
    color:#7A7A7A;
}

.Cutting_series{
    width:258px;
    height:45px;
    line-height: 45px;
    border-bottom: 1px solid #154F97;
}
.Cutting_series a{
    color:#7A7A7A;
    font-size: 15px;
}
.what_is_hot{
    text-align: center;
    margin-top:50px;
    margin-bottom:60px;
}
.what_is_hot div:nth-child(1){
    /*height:100px;*/
    color:#333333;
    font-size: 40px;
    font-weight: 600;
}
.what_is_hot div:nth-child(2){
    width:125px;
    height:10px;
    background:#154F97;
    margin-left:45%;

}