// Place all the styles related to the posts controller here.
// They will automatically be included in application.css.
// You can use Sass (SCSS) here: http://sass-lang.com/

body {
	background-color: #f2f2f2;

	margin: 0;
	padding: 0;

	font-family: sans-serif;
}

#container {
	width: 800px - (60px * 2);
	margin-left: auto;
	margin-right: auto;

	padding-left: 60px;
	padding-right: 60px;
	padding-top: 30px;
	padding-bottom: 30px;

	background-color: white;
}

.post {
	margin-bottom: 10px;
}

// Place all the styles related to the posts controller here.
// They will automatically be included in application.css.
// You can use Sass (SCSS) here: http://sass-lang.com/

body {
	background-color: #f2f2f2;

	margin: 0;
	padding: 0;

	font-family: sans-serif;
}

#container {
	width: 800px - (60px * 2);
	margin-left: auto;
	margin-right: auto;

	padding-left: 60px;
	padding-right: 60px;
	padding-top: 30px;
	padding-bottom: 30px;

	background-color: white;
}

#newPostField textarea {
	width: 100%;
	height: 200px;
}

.post {
	margin-bottom: 10px;
}

Change textarea width and height
Change textarea width and height
