.about-navlist li .box{display: block; position: relative;}
.about-navlist li .imgratio{padding-top: 61.4%;}
.about-navlist li .txt{position: absolute; left: 8%; right: 8%; top: 0; bottom: 0; display: flex; align-items: center; z-index: 2; color: #fff; font-size: 2em; font-weight: bold;}
.about-navlist li .txt span{display: flex; align-items: center;}
.about-navlist li .txt span:after{content: ''; width: 28px; height: 28px; background: url(../images/icon_arrow.png) no-repeat; background-size: 100%; margin-left: 10px; min-width: 28px;}

@media (max-width: 480px) {
  .about-navlist li .txt{font-size: 1.75em;}
  .about-navlist li .txt span:after{width: 20px; height: 20px; min-width: 20px;}
}