body {
    height: 135px;
    background-color: #EFEFEF;
    width: 400px;
}

#notifications {
    margin-bottom: 5px;
}

.container {
    margin-top: 20px;
}

.select2 {
    width: 300px;
}

ul.select2-results {
 max-height: 70px;
}
body {
    height: 135px;
    background-color: #EFEFEF;
    width: 400px;
    min-height: 400px;
}

#notifications {
    margin-bottom: 5px;
}

.container {
    margin-top: 20px;
}

.select2 {
    width: 300px;
}

ul.select2-results {
 max-height: 300px;
}
Increase display height of container and select2 results
Increase display height of container and select2 results
