.main-container {
  font-family: PingFangSC-Medium;
  display: flex;
  flex-wrap: wrap;
  flex-direction: column;
  justify-content: flex-start;
  background-color: gold;
}
.demo{
  flex-direction: column;
  width: 100%;

}
.demo_header{
  align-items: center;
  margin-top: 20px;
  position: relative;
}
.back_button{
  width: 200px;
  height: 40px;
  font-size: 32px;
  position: absolute;
  left: 0;
  top:30px;
  text-align: left;
  z-index: 2;
  background-color: #fff;
  color: #272c34;
}
.demo_title{
  height: 100px;
  width: 100%;
  align-items: center;
  font-size: 32px;
  font-weight: 500;
  justify-content: center;
}

.demo_block_name{
  background-color: #daf9ca;
  font-size: 28px;
  color:#8a8a8f;
  padding:0 20px;
  width: 100%;
  height:90px;
  align-items: center;
}
.demo_contain{
  padding:30px 20px;
  flex-direction: column;
}
.sample_contain{
  display: flex;
  flex-direction: column;
}
.contain_text {
  font-size: 30px;
  line-height: 45px;
}
.commom_tcolor {
  color: #272c34;
}
.contain {
  background-color: #ffffff;
  padding-top: 40px;
  padding-left: 30px;
  flex-direction: column;
}


.bg_color {
  background-color: #000000;
}
.color_blue_d {
  color: rgb(79, 148, 208);
}
.color_blue_l {
  color: rgb(156, 220, 254);
}
.color_yellow_d {
  color: rgb(230, 130, 84);
}
.color_yellow_l {
  color: rgb(220, 220, 170);
}
.color_red {
  color: rgb(199, 0, 80);
}
.margin_b {
  margin-bottom: 30px;
}
.style_ta {
  color: rgb(169, 169, 169);
  font-size: 30px;
  margin-top: 15px;
}
.color_green {
  color: rgb(96,153,85);
}
.text_color {
  color: #267aff;
}
.circleall{
  width: 100%;
  flex-direction: row;
  justify-content: center;
  padding:20px;
}
.button {
  margin-top: 15px;
  width: 90%;
  height: 80px;
  text-align: center;
  font-size: 28px;
  border-radius: 40px;
  background-color: #317aff;
}
.perch_none_0{
  width:10px;
}
.perch_none_1{
  width:20px;
}
.perch_none_2{
  width:40px;
}
.perch_none_3{
  width:60px;
}
.perch_none_4{
  width:80px;
}