.wrapper {
    min-height: 100%;
}

.main {
    width: 50em;
    margin: 0 auto;
    padding: 0;
}

header {
    text-align: center;
}

.sidebar {
    width: 15em;
    float: right;
    text-align: center;
    position: relative;
}

.lessons, .courses {
    float: left;
    width: 35em;
}

.photo {
    width: 9em;
    height: 9em;
}

.lesson {
    margin-bottom: 1em;
    border-left: 1px solid #487de5;
    padding-left: 0.5em;
}

.lesson_topic {
    display: inline-block;
    font-weight: bold;
    margin: 0.5em;
}


.contest_link {
    margin-left: 0.5em;
    display: inline-block;
}

.authors {
    margin-left: 0.5em;
}

body {
    font-family: 'Open Sans', sans-serif;
}

a {
    color: #2a6478;
    text-decoration: none;
    transition: 300ms;
    border-bottom: 1px solid transparent;
}

a:hover {
    border-bottom: 1px solid #2a6478;
}

.course {
    margin-bottom: 1em;
    border-left: 1px solid #487de5;
    padding-left: 0.5em;
    font-size: 1.5em;
    font-weight: bold;
}