Do you know what CPU you have? such as Intel I7 4820K?

I assume your processor is the Intel - i3 version: if it is the maximum SAFE temperature is: 72.6°C as per: Intel's Website

There are three different processors that you could have: i3, i5, i7.... so if you can figure that out get back with me and I will look up the maximum safe temperature, as the thermal property's are different with each processor.

70 degrees is fine, we will consider overheating after 97 degrees so your system is working properly. 

I have the i5 version. 

dont worry, the most references of intel processors can reach 100°C before shut down 

less than 80°C is perfect, you have 10°C less than that, so you are very secure :) 

i am happy that it helped you :) please mark that i answered your question

and put something in the back of your laptop while gaming... this help a lot to reduce heat 

have a nice day 

Your answer is correct to the best of my knowledge on the subject. So don't worry about the CPU temp being less than 80°C.