.regex-tester-container{margin:20px auto;padding:20px;border-radius:8px;box-shadow:0 2px 10px rgba(0,0,0,.1);background:#fff}.regex-tester-form .error-message{color:red;margin-top:10px;padding:10px;text-align:center}.regex-tester-form .form-group{margin-bottom:40px}.regex-tester-form .form-group:last-of-type{margin-bottom:10px}.regex-tester-header{margin-bottom:20px}.regex-tester-form label{display:block;margin:10px 0}.regex-tester-form input,.regex-tester-form textarea{width:100%;padding:10px;border-radius:4px;border:1px solid #ccc}.regex-tester-form textarea{background:#fff;padding:15px}.regex-tester-form button{font-size:16px;border:none;cursor:pointer;margin-top:10px}.regex-tester-results ul{list-style-type:none;padding:0}.regex-tester-container{position:relative}.regex-tester-results{padding:20px 0;margin:30px 0}.regex-tester-results h2{color:#333;font-size:20px;margin-bottom:20px}span.highlight{background:#004eac;color:#fff;padding:0 5px}div#results{line-height:2.5;font-size:17px;padding:20px;background:#e6f7ff}