* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html,
body {
    width: 100%;
    height: 100%;
}
.container {
    width: 100%;
    background: #94E273;
}
img{
    width: 100%;
    display: block;
}
main {
    padding: 0px 16px 24px 16px;
}
.course {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin: 25px 0;
}
.course a {
    width: 48%;
    min-height: 236px;
    margin-bottom: 18.5px;
    display: block;
}
.course img {
    width: 100%;
    height: 100%;
}
.course a:nth-last-child(2),
.course a:nth-last-child(1) {
    margin-bottom: 0;
}