page.css

body.tank {
    background: url("images/classes.jpg");
    background-repeat: no-repeat;
	background-attachment: fixed;
	background-position: top center;
	font-family: Verdana, Arial;
	color: black;
	margin: 0 auto;
	padding: 0;
	-webkit-background-size: cover;
	-moz-background-size: cover;
	-o-background-size: cover;
	background-size: cover;
	font-family: Verdana,Arial;
	color: black;
	margin: 0 auto;
	box-sizing: inherit;
	font-size: 15px;
    line-height: 1.5;
	-webkit-text-size-adjust: 100%;
	display: flex;
	flex-direction: column;
	min-height: 100vh;
}

header {
	box-shadow: 0px 3px 3px black;
	margin: 0px 0px 20px 0px;
	min-width: 100%;
	min-height: max-content;
	max-height: 20hv;
	padding: 0px 0px 10px 0px;
	border: 1px solid black;
	box-sizing: border-box;
	text-size-adjust: 100%;
	background-color: grey;
}

h1,h2 {
	text-size-adjust: 100%;
}

div.chatbot-container {
	background-color: #f5f5f5;
}

main.chat-container {
	background-color: #fff;
	border-radius: 5px;
	box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
	align-items: center;
	margin-bottom: 10px;
	border-radius: 5px;
	font-size: 16px;
	word-wrap: break-word;
	flex: 1;
    overflow-y: scroll;
	padding: 7px 7px 7px 7px;
	margin-bottom: 2vh;
	min-width: max-content;
	max-width: max-content;
	min-height: max-content;
	max-height: max-content;
}

iframe {
	min-height: 60vh;
	max-height: 80vh;
	min-width: 70vw;
	max-width: 100%;
}

img.loger {
	max-height: 115px;
	max-width: 121px;
	float: left;
	border: 1.5px solid black;
}

h1.liner {
	text-align: center;
}

footer {
	box-shadow: 0px 3px 3px black;
	margin: 0 auto;
	min-height: 10vh;
	min-width: 100%;
	padding: 0 auto;
	position: static;
	bottom: 0;
	margin-bottom: -0.5vh;
	padding-bottom: -0.5vh;
	margin-top: 0.5vh;
	box-shadow: 0px 3px 3px black;
	text-align: center;
	background-color: #000000;
	text-align: center;
}

div.copier {
	background-color: black;
	color: white;
	text-align: center;
	font-size: 3.5vh;
	margin-top: 10hv;
	margin-bottom: -100vh;
	padding-bottom: -100vh;
}