代码片段：
#Santa_Message {
position: absolute;
overflow-y: scroll; /* has to be scroll, not auto */
-webkit-overflow-scrolling: touch; /* Accelerates Overflow Scrolling on IOS */
padding:15px;
margin: auto;
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
height: 60%;
width: 60%;
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