.gray-box__arrow{position:relative;padding-bottom:60px}
.gray-box__arrow:before{position:absolute;content:"";width:0;height:0;border-style:solid;border-width:25px 20px 0;border-color:#222 transparent transparent;top:50%;left:50%;transform:translate(-50%,-50%)}
/*250903 iplanet追記分*/
.ml50{margin-left:50%;}
@media print,screen and (max-width:767px){
.gray-box__arrow{padding-bottom:50px}
.gray-box__arrow:before{border-width:22px 18px 0;top:60%;transform:translate(-50%,-50%)}
}