body {
  max-width: 1600px;  /* Set your desired total width */
  margin:0 auto;
}
header {
  text-align:center;
  padding:20px;
}
header img {
  min-width:400px;
  width:50%;
}
#aboutus {
  border-bottom:5px solid #000;
  font-size:1.1em;
  margin:0px auto 20px auto;
  padding:0 20% 20px 10%;
}
#aboutus h3 {
  margin-bottom:0;
}
#aboutus p {
  margin-top:0;
}

.image-container {
  display: flex;
  width:90%;
  height: 650px;
  margin:0 auto;
}

.image-container img {
  width: 0;
  flex-grow: 3;
  height: 100%;
  object-fit: cover;
  transition: flex-grow 0.4s ease;
  cursor:pointer;
}

.image-container img:hover {
  flex-grow: 5; 
}