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

body {
    background: #0066FF;
    display: flex;
    min-height: 100vh
    
}

form {
    margin: auto;
    width: 50%;
    max-width: 500px;
    background: #999999;
    padding: 30px;
    border: 1px solid rgba (0,0,0,0.2); 
}

h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #FFFFFF; 
}

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

input[type="button"] {
    background: linear-gradient(#33FF33,#000000);
    border:0;
    color: white;
    opacity: 0.8;
    cursor: pointer;
    border-radius: 20px; 
    margin-bottom: 0;
}

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

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

@media (max-width:480px) {
    form {
        width: 90%;
    }