Perfectly Centering Text

Perfectly Centering Text in Round Button?

 

button {
  margin: 0;
  padding: 0;
  font-size: 15px;
  border: none;
  border-radius: 50%;
  background: black;
  color: white;
  width: 50px;
  height: 50px;
  transition: transform 2s;
  font-family: arial;
    line-height: 50px;
}

button:hover {
  transform: rotate(360deg);
}
button:before{
content:"";
}

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