html - Background Image not showing up in jumbotron -

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i not know problem is. made style.css , used code 

.jumbotron {     background-image:url(images/bikebg.jpg);     margin-top:-20px }

before putting background in images folder, worked fine. since changed it, no longer work. site live here http://bikesite.web44.net/bikes.html

try this

   .jumbotron {         background-image:url(../images/bikebg.jpg);         margin-top:-20px     }

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