@charset "utf-8";

section {
    width:100%;
    max-width:800px;
    margin:30px auto 0;
}
section img{
    margin:0 auto;
    text-align: center;
    display: block;
    max-width: 100%;
 }
section .chui{margin: 30px auto 0;}

/* btn */
.arrow_s {
  position: relative;
  display: inline-block;
  padding-right: 6px;
}
.arrow_s:before {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 8px 0 8px 10px;
  border-color: transparent transparent transparent #fff;
  position: absolute;
  top: 0;
  left: 450px;
  bottom: 0;
  margin: auto;
}

.btn{
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.5;
  position: relative;
  display: block;
  max-width: 500px;
  padding: 1rem 0;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  text-align: center;
  vertical-align: middle;
  text-decoration: none;
  letter-spacing: 0;
  border-radius: 0.5rem;
  color: #fff;
  background-color: #e60012;
  border-bottom: 5px solid #9c030f;
  margin: 30px auto 0;
}

a.btn:hover {
  margin-top: 33px;
  color: #fff;
  background: #e60012;
  border-bottom: 2px solid #9c030f;
}

@media only screen and (max-width:640px){
  .btn{font-size: 1.3rem; margin-top: 20px;}
  .arrow_s:before {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 8px 0 8px 10px;
  border-color: transparent transparent transparent #fff;
  position: absolute;
  top: 0;
  left: auto;
  right: 10px;
  bottom: 0;
  margin: auto;
}
}