.Drill_head_Tittle{
 width: 100%;
 height: auto;
 /* background-color: aquamarine; */

}
.Drill_head_Tittle .big_tittle{
 display: flex;
 justify-content: center; /* 水平居中 */
 align-items: center;
 width: 100%;
 /* background-color: aqua; */
 
}
.big_tittle1{
 display: block;
 margin-top: 10px;
 margin-bottom: 20px;
}

.big_tittle2{
 display: block;
 margin-top: 10px;
 margin-bottom: 20px;
 text-indent: 2em;
 color: rgb(17, 103, 233);
 font-size: 20px;

}
.big_tittle3{

 display: block;
 width: 100%;
 height: 500px;
 margin-top: 30px;
 /* background-color: rgb(43, 168, 226); */
}
.big_tittle3 img{
 width: 100%;
 height: 100%;
}

i{
 font-style: normal;
 font-size: 20px;
  color: blue; 
}
.big_tittle h2{
 padding-top:20px;
 padding-bottom: 20px;
 font-size: 28px;
}
.middle{
 padding-left: 30%;
 width: 40%;
 height: auto;
 /* background-color: blueviolet; */
}
.Sort{
 width: 100%;
 height: 51px;
 /* background-color: aqua; */
 margin-top: 30px;
}
.Sort_span{
 display: block;
 float: left;
 height: 50px;
 border: 3px solid rgb(53, 51, 51);
 width: 50px;
 text-align: center;
 margin-right: 25px;
}
.Sort_span a {
 font-size: 20px;
 font-weight: bold;
 text-decoration: none;
 line-height: 50px;
 font-size: 37px;
 color: darkgray;
}