How to change the search icon color of the ion -searchbar?

I am using the ion-searchbar and it has a default search icon. The icon is a background image. I want to change the color of the icon to red. I saw the background image for the search icon using chrome developer tools:

url("data:image/svg+xml;charset=utf-8,<svg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20512%20512'><path%20fill='%235b5b5b'%20d='M337.509,305.372h-17.501l-6.571-5.486c20.791-25.232,33.922-57.054,33.922-93.257C347.358,127.632,283.896,64,205.135,64C127.452,64,64,127.632,64,206.629s63.452,142.628,142.225,142.628c35.011,0,67.831-13.167,92.991-34.008l6.561,5.487v17.551L415.18,448L448,415.086L337.509,305.372z%20M206.225,305.372c-54.702,0-98.463-43.887-98.463-98.743c0-54.858,43.761-98.742,98.463-98.742c54.7,0,98.462,43.884,98.462,98.742C304.687,261.485,260.925,305.372,206.225,305.372z'/></svg")

According to this answer, i changed the fill to ‘FF0000’ but the color of the icon did not change to red.

I tried using below:

.searchbar-search-icon {
   background-image: url("data:image/svg+xml;charset=utf-8,<svg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20512%20512'><path%20fill='FF0000'%20d='M337.509,305.372h-17.501l-6.571-5.486c20.791-25.232,33.922-57.054,33.922-93.257C347.358,127.632,283.896,64,205.135,64C127.452,64,64,127.632,64,206.629s63.452,142.628,142.225,142.628c35.011,0,67.831-13.167,92.991-34.008l6.561,5.487v17.551L415.18,448L448,415.086L337.509,305.372z%20M206.225,305.372c-54.702,0-98.463-43.887-98.463-98.743c0-54.858,43.761-98.742,98.463-98.742c54.7,0,98.462,43.884,98.462,98.742C304.687,261.485,260.925,305.372,206.225,305.372z'/></svg>")!important;
  }

Can anyone point me out what should be the way to change the color of the icon?

See: https://robferguson.org/blog/2018/04/09/theming-your-ionic-3-app-bespoke-svg-icons/

For example, the green star icons and the blue tab bar icons):