css - cover div adding a margin -


i have #cover div following css

#cover {     background-color: #ffffff;     height: 100%;     opacity: 0.4;     position: fixed;     width: 100%;     z-index: 9000; }

i want cover entire (viewed) page so

enter image description here

however when scroll down see this

enter image description here

thats because margin of 8 added top , left.

i tried adding margin:-8 -8 8 8; no success. why??? , how can fix this?

demo fiddle.

you fogot set position. add:

top: 0; left: 0;

since havn't posted complete markup, can assume body has margin or padding causing shift you're seeing.


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