Generated by SassMeister.com.

SassMeister-input-HTML.html

<a href="#" class="Btn">light red</a>

SassMeister-input.scss

// ----
// Sass (v3.4.13)
// Compass (v1.0.3)
// ----

$btCol: #ff6600;

.Btn {
    background-color: #fff;
    border: 1px solid $btCol;
    display: inline-block;
    cursor: pointer;
    color: #000;
    font-size: 12px;
    padding:5px 5px;
    text-decoration: none;
    text-transform: uppercase; //why won't convert the text to uppercase?
}
.Btn:hover {
    background-color: lighten($btCol, 50%);
    text-decoration: none;
}
.Btn:active {
    position: relative;
    top: 1px;
}
.Btn:disabled {
    background-color: #eb675e;
    color: #999;
}

SassMeister-output.css

.Btn {
  background-color: #fff;
  border: 1px solid #ff6600;
  display: inline-block;
  cursor: pointer;
  color: #000;
  font-size: 12px;
  padding: 5px 5px;
  text-decoration: none;
  text-transform: uppercase;
}

.Btn:hover {
  background-color: white;
  text-decoration: none;
}

.Btn:active {
  position: relative;
  top: 1px;
}

.Btn:disabled {
  background-color: #eb675e;
  color: #999;
}

SassMeister-rendered.html

<a href="#" class="Btn">light red</a>