* {
margin: 0;
font-family: sans-serif;
box-sizing: border-box;
}

body {
background: #dedede;
display: flex;
min-height: 100vh;
}

form {
margin: auto;
width: auto;
background: #f3f3f3;
padding: 30px;
border: 1px solid rgba(0,0,0,0.2);
}

h2 {
text-align: center;
margin-bottom: 20px;
color: rgba(0,0,0,0.5);
}

input {
display: block;
padding: 10px;
width: 100%;
margin: 30px 0;
font-size: 20px;
}

input[type="submit"] {
background: linear-gradient(#ffda63, #ffb940);
border: 0;
color: brown;
opacity: 0.8;
cursor: pointer;
border-radius: 20px;
margin-bottom: 0;
}

input[type="submit"]:hover {
opacity: 1;
}

input[type="submit"]:active {
transform: scale(0.95);
}

@media (max-width:735px) {
form {
width: auto;
}
}