div.main {
    width: 40%;
    max-width: 800px;
    min-width: 600px;
    border: 1px solid #ccc;
	border-radius: 10px;
    background-color: var(--grey);
    padding: 50px;
    font-family: Arial, sans-serif;
}

body.main {
    padding-top: calc(34%/2);
    padding-bottom: calc(35%/2);
    max-height: 100%;
    overflow: hidden;
}

body.main2 {
    padding-top: calc(20%/2);
    padding-bottom: calc(35%/2);
    max-height: 100%;
    overflow: hidden;
}

button {
    background-color: var(--green);
    color: white;
    padding: 14px 20px;
    margin: 8px 0;
    border: 1px solid var(--green);
	border-radius: 4px;
    cursor: pointer;
    width: 100%;
}

  
button:hover {
    opacity: 0.8;
}

@media only screen and (max-width: 820px) {
	input, button, div.main {
		font-size: 30px;
	}

    div.main {
        width: calc(100% - 120px);
        min-width: unset;
        margin:unset;
        min-height: 450px;
    }
}