.pace-calculator{.container{margin:0 auto;max-width:1200px;padding:20px}h4{font-size:2rem;color:#333;margin-bottom:20px}.text-center,h4{text-align:center}.button{background-color:black;color:#fff;border:none;padding:10px 20px;font-size:1rem;cursor:pointer;border-radius:5px;transition:background-color .3s}.button:hover{background-color:gray}.inputField{padding:10px;font-size:1rem;border-radius:5px;border:1px solid #ccc;margin:10px 0;text-align:left}.result{background-color:#f0f8ff;padding:20px;border-radius:5px}.error,.result{text-align:center}.error{color:red;font-weight:700;margin-top:20px}}