#menu_list a:nth-child(2)::after{
    background: #ddd;
    transform: scale(1, 1);
}

#menu_list a:nth-child(2):hover::after {
    background: #93cdff;
  transform: scale(1, 1);
}
.page_br{display: none;}
#back_text p{max-width: 1030px;}

@media screen and (max-width:980px){
    #material_h3{font-size:16px;}
}

@media screen and (max-width: 720px){
    #material_h3{font-size:15px;}
}

@media screen and (max-width: 500px){
    #material_h3{font-size:14px;}
    h3{font-size: 14px; text-align: left;}
}

@media screen and (max-width:380px){
    .page_br{display: block;}
}