html - Full sized background image in div? -

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i want full sized background image, inside div. div last element, want fill bottom of page. far, have code, makes fill sides, changing height 100% makes disappear, , can't seem fill page.

.launch {     background: url('images/launchbackground.jpg') no-repeat center center fixed;    -webkit-background-size: cover;   -moz-background-size: cover;   -o-background-size: cover;   background-size: cover; }

without seeing html, have tried:

background-image: url('images/launchbackground.jpg')

also can try set manually:

.launch {   top: 0px;    left: 0px;    min-height: 100%;   min-width: 100%;   position: fixed;  }

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