#joining a{color:#fff!important;}
#bigImg{background:url(../img/4_combination.jpg) no-repeat 0 10%;}

.box1 .img{background:url(../img/4_combinationSmall.jpg) no-repeat 50% 10%;}
.box2 .img{background:url(../img/3_sharingSmall.jpg) no-repeat 50% 60%;}
.box3 .img{background:url(../img/5_foundationsSmall.jpg) no-repeat 50% 0%;}