Hintergrundmuster hinzufügen

.article01 {
 width: 85%;
 height: 1800px;
 background-image: url('../bilder/pattern.png');
 background-attachment: fixed;
 border-left: grey 1px dotted;
 border-right: grey 1px dotted;
 padding: 10px;
 background-color: #e8f3ea;
}