How do I achieve a 360 Infinite Rotating Circle Animation with css?

Hello to all! 

I am trying to achieve an infinite 360 rotating circle animation for a client website  (7.1)

To see exactly what i'm trying to achieve, look at this websites home page  https://www.alexcantone.com/ 

I've tried googling this but have had no luck!

Would the css required be something like the below?  Or not at all? 
 

#block-yui_3_17_2_1_1634295033920_10337 {animation: turn 15s linear infinite;
}

Any help or guidance would be greatly appreciated .... thank you in advance!

Ruby Rose 

Hey @Ruby-Rose try to add the next code:

#block-yui_3_17_2_1_1634295033920_10337 {
  -webkit-animation: spin 15s linear infinite;
  -moz-animation: spin 15s linear infinite;
  -o-animation: spin 15s linear infinite;
  animation: spin 15s linear infinite;
}

@-webkit-keyframes spin {
  100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

@-moz-keyframes spin {
  100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

@-o-keyframes spin {
  100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

@keyframes spin {
  100% {
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

@SquareRefresh It worked perfectly!!!! :') Thank you thank you!!!!! 

To make it rotate counter clockwise you can use:

#block-yui_3_17_2_1_1712763199228_154297 {
  -webkit-animation: spin 15s linear infinite;
  -moz-animation: spin 15s linear infinite;
  -o-animation: spin 15s linear infinite;
  animation: spin 15s linear infinite;
}

@-webkit-keyframes spin {
  100% {
    -webkit-transform: rotate(-360deg);
    -moz-transform: rotate(-360deg);
    -o-transform: rotate(-360deg);
    transform: rotate(-360deg);
  }
}

@-moz-keyframes spin {
  100% {
    -webkit-transform: rotate(-360deg);
    -moz-transform: rotate(-360deg);
    -o-transform: rotate(-360deg);
    transform: rotate(-360deg);
  }
}

@-o-keyframes spin {
  100% {
    -webkit-transform: rotate(-360deg);
    -moz-transform: rotate(-360deg);
    -o-transform: rotate(-360deg);
    transform: rotate(-360deg);
  }
}

@keyframes spin {
  100% {
    -webkit-transform: rotate(-360deg);
    -moz-transform: rotate(-360deg);
    -o-transform: rotate(-360deg);
    transform: rotate(-360deg);
  }
}