.problem_user_and_ideal_solutions {
	margin-bottom: 7px;
}

.problem_user_and_ideal_solutions tbody td {
	width: 50%;
}

.problem_user_and_ideal_solutions .visualizer_code {
	margin-bottom: 0;
}

.lesson_sections,
.lesson_sections ul {
	margin: 0;
	padding: 0;
	list-style: none;
	background: rgba(66, 139, 202, 0.1);
}

.lesson_sections {
	padding-left: 0;
	border-bottom: solid 2px #428bca;
}

.lesson_sections li {
	position: relative;
}

.lesson_sections li > a {
	text-decoration: none !important;
	padding: 5px 0;
	display: block;
}

.lesson_sections li > a { padding-left: 30px; }
.lesson_sections li li > a { padding-left: 50px; }
.lesson_sections li li li > a { padding-left: 70px; }

.lesson_sections li a:hover,
.lesson_sections li a:focus {
	background: rgba(0, 0, 0, 0.03);
}

.lesson_sections li > .position_spin {
	background: #6CBAEE;
	position: absolute;
	top: 0px;
	left: 20px;
	width: 2px;
	height: 0px;
}


.lesson_sections .problems_link {
	border-top: solid 1px #6CBAEE;
	background: rgba(255, 255, 255, 0.4);
}


.section > h2, .section > h3, .section > h4, .section > h5, .section > h6,
#problems > h2 {
	/* from http://nicolasgallagher.com/jump-links-and-viewport-positioning/demo/#method-D */
	border-top: 60px solid transparent;
	margin-top: -60px;
	position: relative;
	top: 0px;
	-webkit-background-clip: padding-box;
	-moz-background-clip: padding;
	background-clip: padding-box;
}

/* Task labels need room in the narrow lesson column. */
.lesson_sections .problems_link > a { padding:5px 10px; }
.lesson_sections .problems_link > ul > li > a { padding:5px 12px 5px 16px; overflow-wrap:anywhere; }

/* A completed task keeps the original blue link on a green menu row. */
.lesson_sections .problems_link li.solved { background: rgba(128, 252, 92, 0.3); }
.lesson_sections .problems_link li.solved > a,
.lesson_sections .problems_link li.solved > a.active {
    color: #0275d8;
    background: transparent;
}
.lesson_sections .problems_link li.solved > a:hover,
.lesson_sections .problems_link li.solved > a:focus { background: rgba(0, 0, 0, 0.03); }

/* Original unfinished-task colour, shared by lesson and task menus. */
.lesson_sections .problems_link li.unsolved { background: rgba(252, 168, 132, 0.3); }
.lesson_sections .problems_link li.unsolved > a,
.lesson_sections .problems_link li.unsolved > a.active { color: #0275d8; background: transparent; }
.lesson_sections .problems_link li.unsolved > a:hover,
.lesson_sections .problems_link li.unsolved > a:focus { background: rgba(0, 0, 0, 0.03); }