html - background image for navigation link -

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i trying display background image behind navigation link, not displayed code:

#aboutlink{    background-image: url(sidebar.png);     background-repeat: no-repeat;    background-position: left;    background-color: transparent;     display: block;     margin-bottom: 160px;    text-align: left; }

set width , height of navigation link, otherwise image cut off , won't display fully


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