.sectionA{background-color:#343634;border:2px solid #000;border-radius:10px;box-sizing:border-box;color:#fff;font-family:Arial,sans-serif;font-size:28px;height:50%;line-height:1;margin-left:10%;margin-top:20px;padding:0;position:relative;text-align:center;width:80%}@media only screen and (max-width:600px){.sectionA{margin-left:10px;width:calc(100% - 20px)}}