jquery - how to keep the background image height same throughout all page width? -

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the background image width 1579px, beyond if stretch browser 1920px, background image height changes, though have given fixed div width(650px). how can keep background height same throughout page widths?

css:

.blue_bg1{         background: url("../images/hero-bg-espresso.jpg") no-repeat;     height: 650px;     background-position: center center;     background-size: 100% auto;     width: 100%; }

use cover property. so:

.blue_bg1 {  background-size: cover; }

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