.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, 0.07);
}

.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;
}

@media (min-width: 768px) {
    .lesson_sections li > a {
        padding: 5px 0px 5px 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;
}

@media (max-width: 768px) {
    .lesson_sections li > .position_spin {
        display: none;
    }
}

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

.section {
    margin-top: 40px;
}

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