style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Courier New', Courier, monospace;
}

.container{
    width: 100%;
    height: 100vh;
    background: cornsilk;
    display: flex;
    align-items: center;
    justify-content: center;
}

form{
    background: #fff;
    display: flex;
    flex-direction: column;
    padding: 2vw 4vw;
    width: 90%;
    max-width: 600px;
    border-radius: 10px;
}

form h3 {
    color: #555;
    font-weight:800px;
    margin-bottom:20px;
}

form input, form textarea {
    border: 0;
    margin: 10px 0;
    padding:20px;
    outline: none;
    background: #eeee;
    font-size: 16px;
}

form button{
    padding: 15px;
    background: #ff5f5f;
    color: cornsilk;
    font-size:18px;
    border: 0;
    outline: none;
    cursor: pointer;
    width: 150px;
    margin: 20px auto 0;
    border-radius: 30px;
}