How to add a border colour

Answer 1

Using border-color property you can set the color of four borders.
Note: Always declare the border-style property before the border-color property. An element must have borders before you can change the color
Examples:
border-color: red green blue pink;
top border is red, right border is green, bottom border is blue and left border is pink
border-color:red green blue;
top border is red, right and left borders are green and bottom border is blue
border-color:red green;
top and bottom borders are red, right and left borders are green
border-color:red;
all four borders are red.
You can also try this way:
border-left-color, border-top-color, border-right-color and border-bottom-color

Answer 2

thank you

Answer 3

border style?? what is a border style

Answer 4

It is also a property.
Example:
p {
    border-style: solid;
    border-color: #ff0000 #0000ff;
}

Answer 5

for border colour, you need to learn CSS...
p{
border: 2px solid green;
}
or
p{
border-style: solid;
border-color: green;
}