.input,div .welcome{display:flex;flex-direction:column;align-items:center;justify-content:center;height:90vh;text-align:center}.input input{width:80%;padding:12px 16px;border-radius:6px;font-family:inherit;border:1px solid #ccc;margin-top:10px;margin-bottom:10px}div.welcome>h1{color:#333;font-size:3em;margin-bottom:10px}.welcome>p{color:#555;font-size:1.2em;margin-bottom:10px}.difficulty{display:flex;justify-content:center}.nav{position:fixed;top:0;left:0;right:0;height:80px;display:flex;align-items:center;z-index:999;border-bottom:1px solid #d3d3d3;background-color:#1b1f3b;color:#fafafa}.nav *,.question-list *{display:inline}.nav li,.question-list li{margin:20px}.nav li :-webkit-any-link{color:#fafafa;text-decoration:none}.nav li :any-link{color:#fafafa;text-decoration:none}.nav h1,.question-list h1{margin-left:20px}.question-list{margin-bottom:20px}button{background-color:#007bff;color:#fff;font-size:1.2em;padding:10px 20px;margin:10px;border:none;border-radius:5px;cursor:pointer;transition:background-color .3s ease,transform .2s ease}button:hover{background-color:#0056b3;transform:translateY(-2px)}button:active{background-color:#003d7a;transform:translateY(2px)}.footer{margin-top:100px;position:relative;left:0;bottom:0;width:100%;color:#555;text-align:center;background-color:#fff}.footer :-webkit-any-link{color:#555;text-decoration:none}.footer :any-link{color:#555;text-decoration:none}button :-webkit-any-link{color:#fff;text-decoration:none}button :any-link{color:#fff;text-decoration:none}.header{padding:10px;text-align:center;font-size:20px}.header *{margin:10px}.question{width:50%;border-radius:50px;background:#e0e0e0;height:-moz-fit-content;height:fit-content;padding:20px;box-shadow:20px 20px 60px #bebebe,-20px -20px 60px #fff;text-align:center;margin:0 auto 10px}.question input{width:80%;padding:12px 16px;border-radius:6px;font-family:inherit;border:1px solid #ccc;margin-top:10px;margin-bottom:10px}.question p{color:#555;font-size:25px;margin-bottom:10px}.result{width:200px;padding:10px;margin:10px 0;border-radius:5px}.result-message{color:#555;font-size:1.2em;margin-bottom:10px;margin-top:95px}