css - Make background image responsive -

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i want make background image responsive both in width in height can run in mobile.

i have used 

.your_background_class_name {     width: 100%;     height:auto;     top: 0px;     left: 0px;     z-index: -1;     position: absolute;  }

but works in width not in height. changes should make work?

html {    background: url(https://encrypted-tbn2.gstatic.com/images?q=tbn:and9gcsvctt0i--skokqvfuvt-i4et6vq5ve7lxpkly9stelcwlkh1ps) no-repeat center center fixed;    -webkit-background-size: cover;   -moz-background-size: cover;   -o-background-size: cover;   background-size: cover; }

know more background-size here.

see demo


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