*{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    box-sizing: border-box;
}
body{
    background: #DEDEDE;
    display: flex;
    min-height: 100vh;
}
form{
    margin: auto;
    width: 50%;
    max-width: 500px;
    background: #F3F3F3;
    padding: 30px;
    border: 1px solid rgba(0,0,0,0.2);
    opacity: 0.8;
}
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(#109DFA, #23BAC4);
    border: 0;
    color: #222222;
    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:768px){
    form{
        width: 75%;
    }
}
@media(max-width:480px){
    form{
        width: 95%;
    }
}
header{
	background: #109DFA;
	border:1px solid yellow;
	}
nav{
	text-align: right;
}
div{
	margin= auto;
}