a.button_back.arrow{
 padding-right: 30px;
}

a.button_back{
 background: #fff;
 color: #8B6441;		
 border: 2px solid #8B6441;
 border-radius: 0px;
 position: relative;
 transition: 0.3s;
 width: auto;
 line-height: 25px;
 padding: 8px 30px;
 display: inline-block;
 text-align: center;
 font-weight: 500;
 font-family: 'Noto Serif JP',"游明朝体","Yu Mincho",YuMincho,"ヒラギノ明朝 Pro","Hiragino Mincho Pro","MS P明朝","MS PMincho",serif;
 box-shadow: rgba(0,0,0,0.25)0px 2px 4px 0px;
}

a.button_back:hover{
 background: #8B6441;
 color: #fff;
}

a.button_back.arrow::after{
 border-color: #8B6441;
 right: 15px;
}

a.button_back.arrow:hover::after{
 border-color: #fff;
}

.button_b{
 padding-right: 15px;
 padding-left: 15px;
 box-sizing: border-box;
}

@media(max-width: 1200px){
.button_b{ 
 padding-right: 7.5px;
 padding-left: 7.5px;
}
}

@media(max-width: 767px){
.button_b{ 
 margin:0 auto;
}
}