darkModebtns.css

.dark-mode-btn-one a {
  text-decoration: none;
  text-transform: uppercase;
  text-align: center;
  width: 220px;
  height: 80px;
  color: #f1c40f;
  font-size: 26px;
  transition: all 0.5s;
  position: relative;
  line-height: 80px;
}

.dark-mode-btn-one a::before,
.dark-mode-btn-one a::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 20px;
  height: 20px;
  background-color: #f1c40f;
  border-radius: 50%;
  transform: translateY(-50%);
  transition: all 0.5s;
  z-index: -1;
  opacity: 0;
}

.dark-mode-btn-one a::before {
  left: 0;
  box-shadow: -100px 0 0 #f1c40f;
}

.dark-mode-btn-one a::after {
  right: 0;
  box-shadow: 100px 0 0 #f1c40f;
}

.dark-mode-btn-one a::after {
  right: 0;
}

.dark-mode-btn-one a:hover::before {
  left: 50%;
  box-shadow: 30px 0 0 #f1c40f;
  transform: translateX(-50%) translateY(-50%);
  opacity: 1;
}

.dark-mode-btn-one a:hover::after {
  right: 50%;
  box-shadow: -30px 0 0 #f1c40f;
  transform: translateX(50%) translateY(-50%);
  opacity: 1;
}

.dark-mode-btn-one a span {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #f1c40f;
  border-radius: 8px;
  transform: scale(0);
  transition: all 0.3s;
  z-index: -1;
}

.dark-mode-btn-one a:hover span {
  transform: scale(1);
  transition-delay: 0.4s;
}

.dark-mode-btn-one a:hover {
  color: #262626;
  transition-delay: 0.4s;
}

.dark-mode-btn-two .btn {
  position: relative;
  width: 155px;
  height: 50px;
  margin: 20px;
}

.dark-mode-btn-two .btn a {
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #ffffff0b;
  box-shadow: 0 15px 35px #38373756;
  border-top: 1px solid #fa34341a;
  border-bottom: 1px solid #ffffff1a;
  z-index: 10;
  color: white;
  border-radius: 30px;
  font-weight: 400;
  letter-spacing: 1px;
  text-decoration: none;
  transition: 0.5s;
  overflow: hidden;
  backdrop-filter: blur(15px);
}

.dark-mode-btn-two .btn:hover a {
  letter-spacing: 3px;
}

.dark-mode-btn-two .btn a::before {
  content: "";
  position: absolute;
  top: 0;
  height: 0;
  width: 50%;
  height: 100%;
  background: linear-gradient(to left, #ffffff26, transparent);
  transform: skewX(45deg);
  transition: 0.5s;
  transition-delay: 0.5s;
}

.dark-mode-btn-two a:hover::before {
  transform: skewX(45deg) translateX(200%);
  transition-delay: 0s;
}

.dark-mode-btn-two .btn::before {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  background: #ee1d40;
  bottom: -5px;
  width: 30px;
  height: 10px;
  border-radius: 10px;
  transition: 0.5s;
  transition-delay: 0;
}

.dark-mode-btn-two .btn:hover::before {
  bottom: 0;
  height: 50%;
  width: 80%;
  border-radius: 30px;
  transition-delay: 0.5s;
}

.dark-mode-btn-two .btn::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  background: #ee1d40;
  top: -5px;
  width: 30px;
  height: 10px;
  border-radius: 10px;
  transition: 0.5s;
  transition-delay: 0;
}

.dark-mode-btn-two .btn:hover::after {
  top: 0;
  height: 50%;
  width: 80%;
  border-radius: 30px;
  transition-delay: 0.5s;
}

.dark-mode-btn-two .btn:nth-child(1)::before,
.dark-mode-btn-two .btn:nth-child(1)::after {
  background: #ee1d40;
  box-shadow: 0 0 5px #ee1d40, 0 0 15px #ee1d40, 0 0 30px #ee1d40,
    0 0 60px #ee1d40;
}

.dark-mode-btn-three a {
  text-decoration: none;
  padding: 20px 40px;
  color: white;
  border: 3px solid white;
  text-transform: uppercase;
  font-size: 25px;
  font-family: sans-serif;
  position: relative;
  transition: all 1s;
  overflow: hidden;
}

.dark-mode-btn-three a:hover {
  background-color: #cd2525;
}

.dark-mode-btn-three a::before {
  content: "";
  background-color: white;
  top: 0;
  left: 0;
  width: 100%;
  height: 50px;
  position: absolute;
  transform: translateX(-100%) rotate(45deg);
  transition: all 1s;
}

.dark-mode-btn-three a:hover::before {
  transform: translateX(100%) rotate(45deg);
}

.dark-mode-btn-four button {
  cursor: pointer;
  text-decoration: none;
  text-transform: uppercase;
  text-align: center;
  background: transparent;
  border: none;
  position: relative;
  width: 220px;
  height: 80px;
  line-height: 70px;
  color: aliceblue;
  font-size: 25px;
  letter-spacing: 10px;
  overflow: hidden;
}

.dark-mode-btn-four button::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 4px;
  background-color: white;
  transition: all 0.5s;
}

.dark-mode-btn-four button:hover::before {
  left: 0;
}

.dark-mode-btn-four button::after {
  content: "";
  position: absolute;
  bottom: 0;
  right: -100%;
  width: 100%;
  height: 4px;
  background-color: white;
  transition: all 0.5s;
}

.dark-mode-btn-four button:hover::after {
  right: 0;
}

.dark-mode-btn-four span::before {
  content: "";
  position: absolute;
  top: -100%;
  right: 0;
  width: 4px;
  height: 100%;
  background-color: white;
  transition: all 0.5s;
}

.dark-mode-btn-four button:hover span::before {
  top: 0;
}

.dark-mode-btn-four span::after {
  content: "";
  position: absolute;
  bottom: -100%;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: white;
  transition: all 0.5s;
}

.dark-mode-btn-four button:hover span::after {
  bottom: 0;
}