.btn-click-pdf-show {
    padding: 5px;
    border: 1px solid #336699;
    background-color: white;
    color: #336699;
    background: none;
    font-size: inherit;
    font-family: inherit;
    outline: none;
    display: inline-block;
    vertical-align: middle;
    cursor: pointer;
    border-radius: 2px;
}

.pdf-preview-show {
    display: none;
    vertical-align: middle;
    border: 1px solid rgba(0,0,0,0.2);
    border-radius: 2px;
}