style.css

* {
 box-sizing: border-box;
}

body {
 margin: 0;
 font-family: Arial, sans-serif;
}

.container {
 max-width: 75rem;
 margin: 10rem auto;
 padding: 2rem;
 box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
 border-radius: 5px;
}

h1, h2 {
 text-align: center;
}

form {
 display: grid;
 grid-template-columns: auto;
 grid-gap: 1rem;
 align-items: center;
}

label {
 font-weight: bold;
 text-align: left;
 margin-right: 1rem;
}

input, select {
 padding: 0.5rem;
 border: 2px solid #ccc;
 border-radius: 5px;
 width: 15rem;
}

input:focus, select:focus {
 border-color: #666;
 outline: none;
}

button {
 background-color: #007bff;
 color: #fff;
 border: none;
 padding: 0.6rem 1.2rem;
 font-size: 1.05rem;
 cursor: pointer;
 border-radius: 5px;
 margin-top: 1.5rem;
}

button:disabled {
 background-color: #666;
}

@media (min-width: 768px) {
 form {
    grid-template-columns: 1fr 1fr 1fr;
 }
}