https://www.w3schools.com/css/css_positioning.asp

örnekler

#fixed1 {
position: fixed
top:50px;
right:0;
width:10%;
}

#fixed2 {
position: fixed
top:50px;
right:0;
left:0
}

#fixed3 {
position: fixed
bottom:50px;
right:0;
left:0
}