join.css

.join-main-section {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-grow: 1;
}

.join-text {
  font-size: 3.5em;
  font-weight: bold;
  margin: 0;
}

.accent-text {
  color: #BC3A80;
}

.join-form {
  background-color: #202027;
  width: 50vw;
  max-width: 50%;
  padding: 2rem 4rem;
  border-radius: 20px;
}

.input-group {
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
}

.input-group:last-child {
  margin-bottom: 0;
}

.input-group label {
  font-weight: bold;
  margin-bottom: .5rem;
}

.input-group input {
  outline: none;
  background: none;
  border: 1px solid #2E3852;
  font-size: 1em;
  padding: .5em;
  color: inherit;
  border-radius: 5px;
}

.input-group input:focus {
  border-color: #596da0;
}

@media (max-width: 900px) {
  .join-main-section {
    flex-direction: column;
    justify-content: center;
  }

  .join-form {
    width: 80vw;
    max-width: inherit;
    margin: 2rem 0;
  }
}

.join-page-circle-1 {
  position: absolute;
  overflow: hidden;
  width: 35vw;
  height: 35vw;
  bottom: 0;
  left: 0;
  z-index: -1;
}

.join-page-circle-1::before {
  content: '';
  transform: translateX(-20%);
  position: absolute;
  height: 100%;
  width: 100%;
  border-radius: 50%;
  background-color: rgb(188, 58, 128, .1);
}

.join-page-circle-2 {
  position: absolute;
  overflow: hidden;
  width: 30vw;
  height: 30vw;
  top: 0;
  left: 20vw;
  z-index: -1;
}

.join-page-circle-2::before {
  content: '';
  transform: translateY(-30%);
  position: absolute;
  height: 100%;
  width: 100%;
  border-radius: 50%;
  background-color: rgb(52, 87, 178, .1);
}