.main4 {
  background: url("../img/section4.png") no-repeat center center fixed;
  background-size: cover;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-align: center;
}

.bg-4 {
  position: absolute;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.67);
  display: flex;
  align-items: center;
  justify-content: center;
}

.development-title {
  font-weight: bold;
}

@media (max-width: 575.98px) {
  .development-title {
    font-size: 1.5rem;
  }
}

/* Small devices (sm) - มือถือทั่วไป (576px ขึ้นไป) */
@media (min-width: 576px) and (max-width: 767.98px) {
  .development-title {
    font-size: 2rem;
  }
}

/* Medium devices (md) - แท็บเล็ต (768px ขึ้นไป) */
@media (min-width: 768px) and (max-width: 991.98px) {
  .development-title {
    font-size: 2rem;
  }
}

/* Large devices (lg)  */
@media (min-width: 992px) {
  .development-title {
    font-size: 2.5rem;
  }
}