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    background-repeat:no-repeat;
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    background-size: cover;
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@media screen and (min-width:700px){
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        background-image:url('https://www.cntech.co.uk/assets/images/r/edinburgh-uni-hqvkb96008dyk35.jpg');
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@media screen and (min-width:980px){
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        background-image:url('https://www.cntech.co.uk/assets/images/1/edinburgh-uni-9mc1ktxpbgakebc.jpg');
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@media screen and (min-width:1400px){
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        background-image:url('https://www.cntech.co.uk/assets/images/1/edinburgh-uni-9mc1ktxpbgakebc.jpg');
        height:530px;
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}