defaultstyles.css

:root {
	--black: #666;
	--blue: #429fd7;
	--green: #5dbb46;
	--orange: #f26722;
	--pink: #da2368;
	--white: #fefefe;
}
* {
	box-sizing: border-box;
}
a {
	color: var(--green);
}
article {
	padding: 0 0 0.47rem;
	margin-bottom: .97rem;
	border-bottom: 1px solid var(--white);
}
body {
	color: var(--black);
	font: 16px/1.5 'Raleway', sans-serif;
}
footer {
	border-top: 1px solid var(--white);
	text-align: center;
	padding: 2rem 0 1.5rem;
}
figure {
	margin: 0;
}
h1,
h2 {
	color: var(--blue);
	margin: .53rem 0 0 .13rem;
}
h3 {
	color: var(--pink);
}
header {
	align-items: center;
	display: flex;
	justify-content: space-between;
}
	header > img {
		margin-left: 1rem;
		max-width: 377px;
	}
	header > nav {
		margin-right: 1rem;
	}
input {
	border: none;
	border-radius: .3rem;
	outline: none;
	padding: .53rem .97rem;
}
input[type='submit'] {
	color: var(--white);
	background: var(--blue);
}
input[type='text'] {
	flex: 1 1 auto;
	margin-right: 4px;
	border: 1px solid var(--black);
}
main ul {
	padding: 0;
}
nav ul {
	display: flex;
	list-style-type: none;
	padding: 0;
}
	nav li {
		margin: 0 0.47em;
	}
		nav a {
			display: block;
			font-size: 0.97rem;
		}

.container {
	display: grid;
	grid-template-rows: 100px auto auto 100px;
	margin: auto;
	max-width: 50em;
	width: 90%;
}
.subscribe-input {
	display: flex;
	width: 100%;
}
.headImage {
	max-width: 100%;
	margin-bottom: .97rem;
}
.mainContent {
	display: flex;
	justify-content: space-around;
}

@media (max-width: 575px) {
	header {
		flex-direction: column;
		justify-content: center;
	}
		header img {
			margin-bottom: 10px;
		}
	nav ul {
		flex-direction: column;
		margin: 0;
	}
		nav li {
			margin-bottom: 5px;
		}

	.container {
		grid-template-rows: 200px auto auto 100px
	}
	.mainContent {
		flex-direction: column;
		justify-content: space-around;
	}
	.subjectMaterialList {
		text-align: center;
	}
		.subjectMaterialList ul {
			list-style-type: none;
		}
	.subscribe {
		text-align: center;
	}
}