* {
     box-sizing: border-box;
   }
   
   body {
     width: 100%;
     height: 100vh;
     margin: 0 auto;
     font-family: system-ui, sans-serif;
     color: black;
   }
   
   h1 {
     text-align: center;
   }
   
   .container {
     background-image: linear-gradient(to top, #fbc2eb 0%, #a6c1ee 100%);
     margin: 0 auto;
     padding: 20px;
     min-width: 300px;
     max-width: 400px;
     border-radius: 10px;
     text-align: center;
   }
   
   input {
     width: 90%;
     padding: 10px;
     font-size: large;
     margin: 5px auto;
   }
   
   #tipAmount {
     width: 85%;
     margin: 10px auto;
     text-align: start;
   }
   
   #totalAmount {
     font-size: x-large;
     font-weight: 600;
   }
   
   button {
     width: 40%;
     padding: 10px;
     font-weight: 500;
     font-size: large;
     cursor: pointer;
   }
   
   button:nth-of-type(2) {
     margin-left: 30px;
   }
   
   footer {
     margin-top: 60px;
     text-align: center;
   }
   
   footer a {
     text-decoration: none;
     color: grey;
   }