.ab_txt{text-align:center;}
.ab_txt img{width:80%;display:block;margin:40px auto;border-radius:10px;}
.ab_txt div{}
.ab_txt h4{}
.ab_txt p{line-height:1.8;color:#333;}

@media screen and (max-width:768px){
    .ab_txt img{width:100%;margin:20px 0}   
}