body {
background: url(images/test.png);
color: #2ecc71;
text-align: center;
line-height: 1.4;
margin: 0;
font-family: Tahoma, Verdana, Arial, Sans-Serif;
font-size: 13px;
overflow-y: scroll;
}
Use this instead, notice I removed "-image"
If it still doesn't work, press ctrl+f5 to hard refresh