$('#box_E3SXpcSuLJ98Pexxm').prop('scrollHeight')
$('#box_E3SXpcSuLJ98Pexxm').scrollTop();


$('#box_E3SXpcSuLJ98Pexxm').prop('scrollHeight') - $('#box_E3SXpcSuLJ98Pexxm').scrollTop() - $('#box_E3SXpcSuLJ98Pexxm').height();

832 - 110 - 249 = 473

