body 
{
    /*height: 100%;*/
    background-color: tomato;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

* 
{
  margin: 0;
  padding: 0;
}

#circle 
{
  width: 100px;
  height: 100px;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  position: relative;
}

.percent 
{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
}