.botan_box {
    width: 100%;
    margin-right: auto;
    margin-left: auto;
    text-align: center;
    display: block;
    margin-bottom: 50px;

}





/*btn_ao_b---------*/

a.btn_ao_b {
  display: flex;
  align-items: center;
  max-width: 230px;
  margin: 0 auto;
  padding: .5rem 1rem;
  border: 1px solid #404040;
  background: #fff;
  text-decoration: none;
  transition: 0.3s;
}
a.btn_ao_b:hover {
    background-color: #F3F3F3;
}
a.btn_ao_b .b__text {
    display: block;
    flex-grow: 1;
    color: #404040;
    text-align: center;
    position: relative;
    padding-right: 15px;
    font-size: 17px;
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 400;	
}
a.btn_ao_b .b__text::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  margin: auto;
  transform: rotate(45deg);
  border-top: 1.5px solid #404040;
  border-right: 1.5px solid #404040;
  box-sizing: border-box;
  width: 12px;
  height: 12px;
  transition: 0.3s;
}