<!-- HTML code -->
<div class="btn">Tertiary</div>

<!-- CSS code -->
.btn {
  width: auto;
  color: white;
  border: 2px solid white;
  padding: 10px 20px;
  background-color: transparent;
  font-size: 15px;
  cursor: pointer;
}

.btn:hover,
.btn:active {
  text-decoration: underline;
}

<!-- HTML code -->
<div class="btn">Tertiary</div>

<!-- CSS code -->
.btn {
  width: auto;
  color: white;
  background-color: transparent;
  padding: 10px 20px;
  border: 2px dashed rgb(1, 238, 206);
  font-size: 15px;
  cursor: pointer;
}

.btn:hover,
.btn:active {
  color: aqua;
}

<!-- HTML code -->
<div class="btn">Tertiary</div>

<!-- CSS code -->
.btn {
  background: transparent;
  color: #888;
  border: none;
  font-size: 20px;
  padding: 8px 16px;
  cursor: pointer;
  transition: color 0.3s ease;
}

.btn:hover,
.btn:active {
  color: #fff;
}

<!-- HTML code -->
<div class="btn">Tertiary</div>

<!-- CSS code -->
.btn {
  background: transparent;
  color: #ccc;
  border: 1px solid transparent;
  font-size: 16px;
  padding: 8px 16px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn:hover,
.btn:active {
  border-color: #00bfff;
  color: #fff;
}

<!-- HTML code -->
<div class="btn">Tertiary</div>

<!-- CSS code -->
.btn {
  background: transparent;
  color: #ccc;
  border: 1px solid #555;
  font-weight: 600;
  font-size: 15px;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn:hover,
.btn:active {
  color: #fff;
  border-color: #00bfff;
}

<!-- HTML code -->
<div class="btn">Tertiary</div>

<!-- CSS code -->

.btn {
  background: transparent;
  color: #bbb;
  border: 1px solid #555;
  padding: 8px 16px;
  font-size: 16px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn:hover,
.btn:active {
  background-color: rgba(0, 191, 255, 0.1);
  color: #fff;
  border-color: #00bfff;
}

<!-- HTML code -->
<div class="btn">Tertiary</div>

<!-- CSS code -->

.btn {
  background: transparent;
  color: #aaa;
  border: none;
  font-size: 16px;
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
  transition: color 0.3s ease, text-shadow 0.3s ease;
}

.btn:hover,
.btn:active {
  color: #fff;
  text-shadow: 0 0 6px #00bfff;
}

<!-- HTML code -->
<div class="btn">Tertiary</div>

<!-- CSS code -->

.btn {
  background: transparent;
  color: #bbb;
  border: none;
  font-size: 16px;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.3s ease, box-shadow 0.3s ease;
}

.btn:hover,
.btn:active {
  color: #fff;
  box-shadow: 0 4px 8px rgba(0, 191, 255, 0.2);
}

<!-- HTML code -->
<div class="btn">Tertiary</div>

<!-- CSS code -->

.btn {
  background: transparent;
  color: #bbb;
  border: none;
  font-size: 20px;
  padding: 8px 16px;
  cursor: pointer;
  position: relative;
  transition: transform 0.3s ease, color 0.3s ease;
}

.btn:hover,
.btn:active {
  transform: translateY(-2px);
  color: #fff;
}

<!-- HTML code -->
<div class="btn">Tertiary</div>

<!-- CSS code -->

btn {
  background: none;
  border: none;
  color: #bbb;
  font-size: 16px;
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn:hover,
.btn:active {
  background-color: #00bfff;
  color: #121212;
}