style.css

* {
   box-sizing: border-box;
   margin: 0;
   padding: 0;
   font-family: sans-serif;
 }
main {
 margin: 2rem auto;
 max-width: 40rem;
 border: 0.5px solid gray;
 padding: 1rem;
 box-shadow: 10px 10px 5px #888888;
}

.header {
 background-color: #4CAF50;
 color: white;
 padding: 1rem;
 text-align: center;
}

.container {
 padding: 1rem;
 display: grid;
 grid-template-columns: 1fr 1fr 1fr 1fr;
 grid-gap: 10px;
}

input[type="text"],
input[type="time"] {
 width: 100%;
 padding: 12px 20px;
 margin: 8px 0;
 display: inline-block;
 border: 1px solid #ccc;
 border-radius: 4px;
 box-sizing: border-box;
}

input[type="number"] {
 width: 100%;
 padding: 12px 20px;
 margin: 8px 0;
 display: inline-block;
 border: 1px solid #ccc;
 border-radius: 4px;
 box-sizing: border-box;
}

button {
 background-color: #4CAF50;
 color: white;
 padding: 12px 20px;
 border: none;
 border-radius: 4px;
 cursor: pointer;
 float: right;
}

.prose {
 padding: 1rem;
 margin: 1rem 0;
 line-height: 1.25;
 border-top: 1px solid #ddd;
 border-bottom: 1px solid #ddd;
}

@media (max-width: 768px) {
 .container {
    grid-template-columns: 1fr;
 }
}