* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

:root {
	--headings: rgb(225, 170, 30);
	--textcolor: rgb(0, 189, 189);
	--hover-color: rgb(209, 209, 209);
	--visted-color: rgb(0, 189, 189);
}

html {
	background-color: black;
	font-size: 10px;
	font-family: Raleway, Tahoma, Verdana, Geneva, sans-serif;
	font-weight: 600;
}

h1 {
	color: var(--headings);
	font-size: 4rem;
	font-weight: bold;
	margin-top: 4rem;
	margin-bottom: 3rem;
}

h2 {
	color: var(--headings);
	font-size: 1.8rem;
	font-weight: bold;
	margin-top: 2rem;
	margin-bottom: 1rem;
}

ul {
	list-style: none;
}

a {
	color: var(--textcolor);
	cursor: pointer;
	text-decoration: none;
}

a:hover {
	color: var(--textcolor);
	font-size: 1.85rem;
}

a:active {
	color: var(--textcolor);
	font-size: 1.75rem;
}

a:visited {
	color: var(--visted-color);
}

li {
	margin-bottom: 1.2rem;
}

.main {
	max-width: 1000px;
	display: grid;
	grid-template-columns: 1fr;
	grid-column-gap: 0px;
	grid-row-gap: 0px;
	margin: auto;
	text-align: center;
	color: var(--textcolor);
	font-size: 1.5rem;
	line-height: 2.75rem;
}

.top-three {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	grid-template-rows: 1fr;
	grid-column-gap: 0px;
	grid-row-gap: 0px;
}

.section {
	border: var(--textcolor) 2px solid;
	overflow: hidden;
	padding: 1.7rem;
}

.search-box {
	background-color: lightgray;
	color: black;
	width: 100%;
	height: 3.5rem;
	padding: 0.5rem;
	font-size: 1.5rem;
	margin-bottom: 1rem;
}

.btn-submit {
	display: block;
	height: 2.75rem;
	background-color: rgb(209, 206, 206);
	padding-left: 1rem;
	padding-right: 1rem;
}

.radar-img {
	width: 100%;
}

.footer {
	margin-top: 2rem;
	color: lightgray;
}

/* Responsive design for mobile devices */
@media screen and (max-width: 768px) {
	.top-three {
		grid-template-columns: 1fr;
	}
	
	h1 {
		font-size: 3rem;
		margin-top: 2rem;
		margin-bottom: 2rem;
	}
}