.mv {
    height: 500px;
    background-image: url("../images/dximage_2.jpg");
    background-size: cover;
    background-position:center;
}


.mv{
    position: relative;
}
.mv_text{
    background-color: rgba(255,255,255,0.8);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    width: 80%;
    padding: 10px 20px;
    font-size: 1.25rem;
}

@media(max-width:500px){
    h1{
        font-size: 1rem;
    }
    .header p{
        font-size: 0.85rem;
    }
    .mv_text{
        font-size: 1rem;
    }
}