Box-shadow:0 0 0; border-color:#ccc; } .search-input-group{ width: 40%; } .search-input-group button{ border:0; background:transparent; } .search-input-group input:focus + button{ z-index:3; } .search-input-group input{ -webkit-transition: width 0.2s ease-in-out; -moz-transition:width 0.2s ease-in-out; -o-transition: width 0.2s ease-in-out; transition: width 0.2s ease-in-out; } .search-input-group input:focus{ width: 500px; }