index.css

body {
  /*background-image: url("https://c1.wallpaperflare.com/preview/93/533/221/train-passenger-train-sbb-db.jpg");*/
  /* background-image: url("https://wallpapercave.com/wp/wp4491116.jpg"); */
  background-image: url("images/background.png");
  margin: 0;
  border: 0;
  box-sizing: border-box;
  background-repeat: no-repeat;
  background-size: cover;
  font-family: "Open Sans", "Helvetica Neue", sans-serif;
  font-weight: bold;
  text-align: center;
  overflow: auto;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.passenger-detail {
  /* display: flex; */
  /* top: 10vh; */
  /* height: 80vh; */
  /* flex-direction: row; */
  /* justify-content: space-around; */
  /* align-items: center; */
  backdrop-filter: blur(10px);
  width: 50%;
  margin: auto;
  padding: 10px;
  background: rgb(255, 255, 255, 0.4);
  /* position: relative; */
  border-right: 25%;
  text-align: center;
  border-radius: 5px;
}

.passenger-detail-container {
  display: flex;
  align-items: flex-start;
  justify-content: space-around;
}

#count-operations {
  /* position: absolute; */
  display: flex;
  flex-direction: column;
  align-items: center;
  /* left: 7.5%; */
  /* top: 20%; */
  width: 40%;
  padding: 40px;
}

#passenger-data {
  /* position: absolute; */
  display: felx;
  flex-direction: column;
  align-items: center;
  padding: 40px;
  /* width: 40%; */
  /* right: 7.5%; */
  /* top: 20%; */
}

h1 {
  margin-top: 10px;
  margin-bottom: 10px;
}

h2 {
  font-size: 50px;
  margin-top: 0;
  margin-bottom: 20px;
}

button {
  border: none;
  padding-top: 10px;
  padding-bottom: 10px;
  color: white;
  font-weight: bold;
  width: 200px;
  margin-bottom: 5px;
  margin: 5px;
  border-radius: 5px;
}

/* added hover effect */

button:hover {
  cursor: pointer;
  transform: scale(1.1);
  transition: 0.5s ease-in;
}

#increment-btn {
  background: darkred;
}

#save-btn {
  background: darkgreen;
}

#reset-btn {
  background: rgb(58, 58, 79);
  width: 100px;
}


.total {
  font-size: 2rem;
  padding: 0px;
  margin: 0px;
}

@media only screen and (max-width: 1280px) {
  body {
    background-image: url(images/background_13.png);
  }
  .passenger-detail {
    width: 60%;
    padding: 40px 10px;
  }

  #count-operations {
    padding: 10px;
  }
  #passenger-data {
    padding: 10px;
  }
}

@media only screen and (max-width: 790px) {
  .passenger-detail {
    width: 85%;
    /* height: 30vh; */
  }
}

@media only screen and (max-width: 500px) {
  button {
    width: 150px;
  }
}

@media only screen and (max-width: 315px) {
  .passenger-detail-container {
    flex-direction: column;
  }
  .passenger-detail {
    padding: 0;
  } 
  #count-operations {
    margin-left:10%;
    width: 70%;
  }
  
}