.codice {
margin : 15px 35px 15px 25px;
padding : 20px 30px 10px 20px;
clear : both;
list-style-type : none;
background : #EEFFFF url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiucucw2Tq9ZYLg4gXV027KcI1xrQYYwzVQPQlgZKt23gJ9fe-35mI8MAzAa42D5NNYa_HjbIftAb9ttvxDu8t9ZQzk1t0b8YPLz-8oR1y_CaE2C4x30XV8LS3ngPKF_QPMdlVA3T2t-QY/s1600/codice-1.gif) no-repeat right bottom;
border : 1px solid #008250;
color : #003366;
}

<div class="codice">
Codice da visualizzare nel riquadro
</div>

.codice { margin : 15px 35px 15px 25px; padding : 20px 30px 10px 20px; clear : both; list-style-type : none; background : #EEFFFF url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiucucw2Tq9ZYLg4gXV027KcI1xrQYYwzVQPQlgZKt23gJ9fe-35mI8MAzAa42D5NNYa_HjbIftAb9ttvxDu8t9ZQzk1t0b8YPLz-8oR1y_CaE2C4x30XV8LS3ngPKF_QPMdlVA3T2t-QY/s1600/codice-1.gif) no-repeat right bottom; border : 1px solid #008250; color : #003366; }