.bookcalcktab{float:left;border:1px solid #ccc;background-color:#f1f1f1;width:30%;height:100%}.bookcalcktab button{display:block;background-color:inherit;color:#000;padding:22px 16px;width:100%;border:none;outline:none;text-align:left;cursor:pointer;transition:.3s;font-size:17px}.bookcalcktab button:hover{background-color:#ddd}.bookcalcktab button.active{background-color:#ccc}.bookcalcktabcontent{display:none;float:left;padding:0 12px;border:1px solid #ccc;width:70%;border-left:none;height:100%}