Porto Theme #

On Porto please do the following since their theme does not have proper CSS code for the rental calendar icon to show on the product page.

Go to Stores > Configuration > Porto > Porto – Settings Panel > Customization

Under the customization settings > custom style 1 copy and paste the following CSS code:

._has-datepicker ~ .ui-datepicker-trigger {
    background-image: none;
    background: none;
    -moz-box-sizing: content-box;
    border: 0;
    box-shadow: none;
    line-height: inherit;
    margin: 0;
    padding: 0;
    text-shadow: none;
    font-weight: 400;
    display: block;
    text-decoration: none;
    display: inline-block;
    margin-top: -4px;
    vertical-align: middle;
}

._has-datepicker ~ .ui-datepicker-trigger:before {
    content: '\F865';
    font-family: 'porto-icons';
    font-size: 23px;
    line-height: 23px;
    color: #7d7d7d;
    vertical-align: middle;
    display: inline-block;
    font-weight: normal;
    overflow: hidden;
    speak: none;
    text-align: center;
    margin-left: 7px;
}

After that please go to system > cache and click the flush magento cache button. Then reload your product page and the rental calendar icons should show properly.