Format of custom message not working

Hi,
I follow the instruction on the add-on documentation page to format the expired message. But the formatting did not work. Please help, thanks.

Custom message:
<div class=”swpm-custom-expired-msg”>您的帳戶已過期。 請續簽您的帳戶, 之後您便可訪問此內容。</div>

Code added to Addition CSS area of the Customizer:
.swpm-custom-expired-msg{
border: 1px solid #002059;
padding: 40px 20px;
}