You need to specify unit of mearuement, such as PX = pixels for width:1000px;
Example from http://www.josephdenaro.com/ using percentages;
Code:
html { color: black; background: #ffffff; margin: 0; padding: 0; }
body { color: black; background: transparent; margin: 0; padding: 0; text-align:center; }
#wrap { color: black; margin: 0 auto; width: 85%; max-width:1000px; min-width: 250px; position: relative; background-color: rgba(255, 255,255, 0.25); z-index:300; }
#space { position: relative; width: 95%; max-width: 450px; min-width: 150px; margin: 6px auto; background: transparent url(../heads/37s.jpg) no-repeat center; text-align:center; padding: 40px; border: medium outset #00ced1; overflow: visible; }
#space img { height: auto; width: 85%; max-width: 350px; min-width: 100px; margin: 0 auto 10px auto; }
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