.operating-container{
  font-family: Arial, sans-serif;
  background-color: #f5f7fa;
  width: 100%;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px;
  overflow-x: hidden;
}

.os-customs{
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #ffffff;
  padding: 40px;
  border-radius: 10px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  width: min(1000px, 100%);
  height: 500px;
}

.select-btn{
  width: 50%;
}

.custom{
  display: flex;
  gap: 20px;
}

select#os-select {
  padding: 10px 15px;
  width: 250px;
  font-size: 16px;
  /* margin-bottom: 30px; */
  border-radius: 6px;
  border: 1px solid #ccc;
 
}

.install-btn {
  /* padding: 12px 30px; */
  padding: 10px 15px;
  background-color: #007bff; /* HP Blue */
  border: none;
  color: white;
  font-size: 16px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s;
  margin: 0;
}

.install-btn:hover{
  background-color: #007bff; /* HP Blue */
  color: #fff;
}

/* Right side image */
.image-side {
  flex: 1;
  text-align: right;
  width: 50%;
}

.image-side img {
  max-width: 390px;
  height: auto;
  border-radius: 10px;
}

@media (max-width: 768px) {
  html,
  body {
    overflow-x: hidden;
  }

  .operating-container {
    min-height: auto;
    padding: 28px 14px;
    align-items: flex-start;
  }

  .os-customs {
    width: 100%;
    height: auto;
    min-height: 0;
    padding: 24px 16px;
    flex-direction: column;
    justify-content: flex-start;
    gap: 24px;
  }

  .select-btn,
  .image-side {
    width: 100%;
  }

  .os-selected h2 {
    font-size: 1.55rem;
    line-height: 1.25;
    margin-bottom: 18px;
  }

  .custom {
    width: 100%;
    gap: 10px;
    align-items: stretch;
  }

  select#os-select {
    min-width: 0;
    width: 100%;
    flex: 1 1 auto;
    font-size: 15px;
  }

  .custom a {
    flex: 0 0 132px;
  }

  .install-btn {
    width: 100%;
    min-height: 46px;
    padding: 9px 10px;
    font-size: 15px;
  }

  .image-side {
    text-align: center;
  }

  .image-side img {
    width: min(280px, 82vw);
    max-width: 100%;
  }
}

@media (max-width: 380px) {
  .custom {
    flex-direction: column;
  }

  .custom a {
    flex-basis: auto;
    width: 100%;
  }
}