Changes to implement:
a) The day the user selects is indicated by a filled square (border-radius: 2px; background-color: #FF883E), color of number of date in white;
b) Add animation when datepicker shows up or dissappears;
c) Get rid off the grid lines;

For further reference on how to animate Datepicker see ->
1. Gif created -> http://recordit.co/pCPtv8JTRD
2. https://jqueryui.com/datepicker/#animation

Picture attached as reference ->
Studio_datepicker_2.png - Suggested changes implemented in a design