* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  width: 100%;
}

h1 {
  text-align: center;
  padding: 20px;
}

div.gallery img {
  width: 100%;
  height: auto;
  border: 1px solid white;
  border-radius: 15px;
}

div.gallery img:hover {
  border: 1px solid black;
  transform: scale(1.03);
}

.main {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
}

.responsive {
  padding: 2px 5px;
  /* width: 24.99999%; */
}

@media only screen and (max-width: 700px) {
  .responsive {
    width: 49.99999%;
    margin: 6px 0;
  }
}

@media only screen and (max-width: 700px) {
  .responsive {
    width: 100%;
  }
}


@media only screen and (max-width: 800px) {
  .main {
    grid-template-columns: 1fr 1fr;
  }
}

@media screen and (max-width: 500px){
  .main{
    grid-template-columns: 1fr;
    align-items: center;
  }
}