.banner.about-us {
  background-image: url(../img/aboutus/banner.jpg);
  background-position: bottom;
  
}

.aboutus h1 {
  display: block;
  text-align: center;
}

.aboutus h3 {
  margin-top: 35px;
  border-bottom: 1px solid #dedede;
  padding-bottom: 5px;
}

.aboutus p {
  text-align: left;
}

section.aboutus {
  display: block;
  max-width: 900px;
  margin: 0 auto;
  font-size: 18px;
  padding: 40px;
  margin: auto;
  
}

.aboutus button {
  background-color: #4caf50;
  color: white;
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  height: 50px;
  font-size: 18px;
  margin-top: 20px;
  cursor: pointer;
}