.default-widget {
     position: relative;
     background-color: #f4f4f4;
     display: inline-block;
     width: 100%;
     border: 1px solid #DEDEDE;
 }

@media only screen and (max-width: 599px) {
    .default-widget {
        border: none;
    }

    body {
        margin: 0;
    }
}