@media (max-width:480px) {
    .section1 .s1_inner > img {width:100%; opacity:.3;}
    .section1 .s1_inner .txtBox {
        text-align:center;
        display:flex;
        flex-direction:column;
        align-items:center;
        justify-content:center;
    }
    .section1 .s1_inner .txtBox h1 {margin:2rem 0 3rem;}
    .section1 .s1_inner .txtBox .txt2 {
        margin:2rem 0 2.5rem;
    }
    .section1 .s1_inner .txtBox a {
        width:85%;
        height:10vh;
    }
}