.select2-container--default .select2-selection--single {
    background-color: #fff;
    border: 1px solid #ccc;
    border-radius: 4px;
    height: 28px;
}

    .select2-container--default .select2-selection--single .select2-selection__rendered, body .select2, .select2-container--default .select2-selection--single .select2-selection__arrow {
        line-height: 28px;
        height: 28px;
    }

.select2-container--open {
    z-index: 9999999;
}
.searchAll {
    display: inline-block;
    background: #0090fc;
    color: #fff;
    border-radius: 3px;
    padding: 0 5px;
    height: 32px;
    line-height: 32px;
    cursor: pointer;
}
#addChapterTree, #addKnowledgeTree, .remove {
    width: 30px;
    height: 26px;
    background: #0090fc;
    display: inline-block;
    font-size: 20px;
    color: #fff;
    border-radius: 3px;
    text-align: center;
    line-height: 26px;
    cursor: pointer;
}