.btn-site {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 10px;
  border: none;
  border-radius: 20px;
  cursor: pointer;
  z-index: 1;
  transition: color 0.3s ease;
  overflow: hidden;
  position: relative;
}
.btn-site::before,
.btn-site::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 100%;
  border-radius: 20px;
  transition: width 0.4s ease-in-out;
}
.btn-site:hover::before {
  width: 100%;
  transition-delay: 0s;
}

.btn-site:hover::after {
  width: 100%;
  transition-delay: 0.1s;
}
.btn-header {
  width: 120px;
  font-size: 18px;
  background-color: var(--green16);
  color: var(--green4);
}
.btn-header:hover {
  color: #fff;
}
.btn-header::before {
  background-color: var(--green17);
  z-index: -2;
  transition-delay: 0.2s;
}

.btn-header::after {
  background-color: var(--green10);
  z-index: -1;
}

.btn-blue {
  font-size: 16px;
  background-color: var(--blue16);
  color: var(--blue4);
}
.btn-blue:hover {
  color: #fff;
}
.btn-blue::before {
  background-color: var(--blue17);
  z-index: -2;
  transition-delay: 0.2s;
}

.btn-blue::after {
  background-color: var(--blue10);
  z-index: -1;
}

.btn-green {
  font-size: 16px;
  background-color: var(--green16);
  color: var(--green4);
}
.btn-green:hover {
  color: #fff;
}
.btn-green::before {
  background-color: var(--green17);
  z-index: -2;
  transition-delay: 0.2s;
}

.btn-green::after {
  background-color: var(--green10);
  z-index: -1;
}