Modern ve Temiz “Yukarı Çık” Butonu (HTML + CSS)

<button class="to-top-btn">
  <svg viewBox="0 0 384 512" class="to-top-icon">
    <path
      d="M214.6 41.4c-12.5-12.5-32.8-12.5-45.3 0l-160 160c-12.5 12.5-12.5 32.8 0 45.3s32.8 12.5 45.3 0L160 141.2V448c0 17.7 14.3 32 32 32s32-14.3 32-32V141.2L329.4 246.6c12.5 12.5 32.8 12.5 45.3 0s12.5-32.8 0-45.3l-160-160z"></path>
  </svg>
</button>

.to-top-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background-color: #1f1f1f;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 0 4px rgba(120, 100, 255, 0.25);
  cursor: pointer;
  overflow: hidden;
  position: fixed;
  right: 20px;
  bottom: 20px;
  transition: all 0.3s ease;
}

.to-top-icon {
  width: 14px;
  transition: transform 0.3s ease;
}

.to-top-icon path {
  fill: white;
}

.to-top-btn:hover {
  width: 150px;
  border-radius: 40px;
  background-color: #7c6cff;
  transition: all 0.3s ease;
}

.to-top-btn:hover .to-top-icon {
  transform: translateY(-200%);
}

.to-top-btn::before {
  position: absolute;
  bottom: -20px;
  content: "Yukarı Çık";
  color: white;
  font-size: 0px;
  transition: font-size 0.3s ease, bottom 0.3s ease;
}

.to-top-btn:hover::before {
  font-size: 14px;
  bottom: unset;
}