.ext-box{
  background: #fff;
  padding: 18px;
}
.ext-ttl{
  color: #e4002b;
  padding-bottom: 10px;
  font-size: 15px;
  line-height: 1;
  border-bottom: 1px dashed #e4002b;
}
@media screen and (min-width: 769px){
.ratio-img{
  width: 80%;
}
}
@media screen and (max-width: 768px){
.ext-box{padding: 3.33333vw;}
.ext-ttl{
  color: #e4002b;
  font-size: 3.6vw;
  padding-bottom: 7.5px;
  padding-bottom: 2vw;
}

}