Your css scripting contains some redundant information:
margin: 0px 0px 0px 0px
should be shorter
margin: 0px

See css tutorials on w3schools.com:
”The margin property can have from one to four values.

margin:25px 50px 75px 100px;
top margin is 25px
right margin is 50px
bottom margin is 75px
left margin is 100px

margin:25px 50px 75px;
top margin is 25px
right and left margins are 50px
bottom margin is 75px

margin:25px 50px;
top and bottom margins are 25px
right and left margins are 50px

margin:25px;
all four margins are 25px”

The same goes for padding etc.