Scroll down arrow not centred on mobile

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I am using code (see below) to add the scroll down arrow as displayed in the image, however on mobile devices the code is not quite centred. How can I get the arrow to be displayed exactly in the centre of the page on mobile?

The code I am using is:

<div class="scroll-down"></div>
<style>
  .scroll-down {
    position: absolute;
    left: 50%;
    bottom: 10px;
    display: block;
    text-align: center;
    font-size: 20px;
    z-index: 100;
    text-decoration: none;
    text-shadow: 0;
  width: 20px;
  height: 20px;
  border-bottom: 1px solid white;
  border-right: 1px solid white;
  z-index: 9;
  left: 50%;
  -webkit-transform: translate(-50%, 0%) rotate(45deg);
  -moz-transform: translate(-50%, 0%) rotate(45deg);
  transform: translate(-50%, 0%) rotate(45deg);
    -webkit-animation: fade_move_down 2s ease-in-out infinite;
    -moz-animation:    fade_move_down 2s ease-in-out infinite;
    animation:         fade_move_down 2s ease-in-out infinite;
}

/*animated scroll arrow animation*/
@-webkit-keyframes fade_move_down {
  0%   { -webkit-transform:translate(0,-10px) rotate(45deg); opacity: 0;  }
  50%  { opacity: 1;  }
  100% { -webkit-transform:translate(0,10px) rotate(45deg); opacity: 0; }
}
@-moz-keyframes fade_move_down {
  0%   { -moz-transform:translate(0,-10px) rotate(45deg); opacity: 0;  }
  50%  { opacity: 1;  }
  100% { -moz-transform:translate(0,10px) rotate(45deg); opacity: 0; }
}
@keyframes fade_move_down {
  0%   { transform:translate(0,-10px) rotate(45deg); opacity: 0;  }
  50%  { opacity: 1;  }
  100% { transform:translate(0,10px) rotate(45deg); opacity: 0; }
}
</style>

Any help would be greatly appreciated!

TIA 😊

It looks like space between left of screen - arrow & arrow - right of screen is equal? Have you tried checked it yet?

On 3/29/2022 at 9:04 AM, tuanphan said:

It looks like space between left of screen - arrow & arrow - right of screen is equal? Have you tried checked it yet?

Yes - I fixed it, thankyou!