*{padding:0;margin:0;box-sizing:border-box}body{font-family:Arial,sans-serif;background-color:#f3f3f3}.container{height:100vh;display:flex;justify-content:center;align-items:center}.calc{background-color:#fff;box-shadow:0 0 10px #0000001a;border-radius:10px;padding:20px;text-align:center}h1{margin-bottom:20px}input{width:calc(100% - 20px);border:none;background-color:#f0f0f0;height:50px;font-size:24px;text-align:right;padding:10px;margin-bottom:20px;border-radius:8px}button{width:calc(25% - 10px);height:50px;background-color:#6dbb1a;color:#fff;font-size:20px;border:none;border-radius:8px;cursor:pointer;margin:5px;transition:background-color .3s ease}button:hover{background-color:#4a8c12}@media screen and (max-width: 768px){.calc{width:80%}button{width:calc(20% - 10px)}}@media screen and (max-width: 480px){input{font-size:18px}button{width:calc(33.33% - 10px);font-size:16px}}