Hello {studentfirstname},
After reviewing your application and conducting our interview, we are very pleased to inform you that we would like to offer you a job as a (job_title) at (company_name). 
If you accept this offer you will receive:
Annual gross salary of: ($x)
A performance bonus
(#) of paid days off
(#) of days of sick leave
Free use of companies facilities
Medical, dental and vision insurance
401k/ retirement plan
Flexible working hours
Childcare
(other benefits)
In order to formally accept our offer, please sign and date this letter and send it back to us by email by (date).
If you accept this offer your start date will be (start_date).
I hope you become a member of our team soon. We are excited to have you!
Best,
(your_name)