*{
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
#commercial {
  width: 80%;
  display: grid;
  margin-left: 50px;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  line-height: 10px;
}
#commercial > div {
  box-shadow: rgba(100, 100, 111, 0.2) 0px 7px 29px 0px;
  border: 1px gray;
  cursor: pointer;
  text-align: center;
  line-height: 10px;
  margin-top: 60px;
  padding: 20px;
}
#commercial > div>h3{
   margin-top: 20px;
}
#commercial > div>h2{
   margin: 20px;
}
#commercial>div>img {
  width: 170px;
  height: 50%;
  margin: 20px;
}

#btn-load {
   color: black;
   cursor: pointer;
   margin: 20px auto;
   display: block;
   font-size: 20px;
   padding: 10px;
   background-color: transparent;
   border-radius: 4px;
}
#btn-load:hover {
  color: blue;
  border: 2px solid black;
}

#footer {
   box-shadow: rgba(100, 100, 111, 0.2) 0px 7px 29px 0px;
  padding-top: 30px;
  width: 100%;
  margin: auto;
  display: flex;
  justify-content: center;
  gap: 150px;
  background-color: silver;
}
#footer > div {
   width: fit-content;
   cursor: pointer;
}
#footer > div > p {
   color: black;
   line-height: 10px;
   margin: 10px;
}
#sidebar {
  border: 1px solid black;
  height: 300px;
  width: 20%;
  text-align: center;
  display: flex;
  cursor: pointer;
  margin-top: 60px;
  margin-left: 30px;
  background-color: steelblue;
  color: white;
}
#sidebar>div>h1{
   margin: 20px;
}
#sidebar>div>h2{
   margin:20px;
}
#block-2 {
  display: flex;
}
#btnback {
  margin-top: 20px;
}

#btnback {
  display: none;
  position: fixed;
  top: 20px;
  right: 30%;
  z-index: 99;
  border: none;
  outline: none;
  background-color: #fff;
  cursor: pointer;
  padding: 15px 20px;
  border-radius: 4px;
  font-size: 18px;
  font-weight: 700;
  border-radius: 50px;
}
#foot{
   width: 100%;
   height: 40px;
   background-color: #002f34;
   display: flex;
   justify-content: space-around;
}
#foot>p{
   margin-top: 10px;
   color: white;
}