style.css

html, body{
  box-sizing: border-box;
  line-height: 18px;
  height: 100px;
  width: 200px;
}

*, *:before, *:after {
  box-sizing: inherit;
}

body {
  font-family: Arial, sans-serif;
  font-size: 15px;
  padding: 1em;
  text-align: center;
}

.hidden{
  display: none!important;
}

#status {
  /* avoid an excessively wide status text */
  white-space: pre;
  text-overflow: ellipsis;
  overflow: hidden;
  max-width: 400px;
}

#loading{
  max-width: 100px;
}

#finished{
  max-width: 20px;
  margin-top: 10px;
}

button,
.button{
    border: 1px solid transparent;
    border-radius: 2px 0 0 2px;
    box-sizing: content-box;
    color: #fff;
    cursor: pointer;
    background-color: #d14836;
    background-image: -webkit-gradient(linear,left top,left bottom,from(#dd4b39),to(#d14836));
    background-image: -webkit-linear-gradient(top,#dd4b39,#d14836);
    background-image: -moz-linear-gradient(top,#dd4b39,#d14836);
    background-image: -ms-linear-gradient(top,#dd4b39,#d14836);
    background-image: -o-linear-gradient(top,#dd4b39,#d14836);
    background-image: linear-gradient(top,#dd4b39,#d14836);
    display: block;
    min-width: 54px;
    font-family: Arial, sans-serif;
    font-size: 11px;
    font-weight: bold;
    height: 27px;
    padding: 0 8px;
    line-height: 27px;
    margin: 1em;
    text-align: center;
    text-decoration: none;
    text-shadow: 0 1px rgba(0,0,0,0.1);
    text-transform: uppercase;
    transition: all 218ms;
}