body {
  font-family: 'Noto Serif', serif;
  margin: 30px;
}
header div {
  font-weight: 300;
}
h1 {
  font-size: 4rem;
  font-weight: 900;
  background: linear-gradient(to right, #0072ff, #c40f64);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  text-align: center;
}
.container {
  display: flex;
  justify-content: space-around;
  margin: 0px;
  padding: 1px;
}
.box {
  width: 600px;
  text-align: left;
}
h3 {
  font-size: 0.9rem;
  background: radial-gradient(#fff, #eee);
  padding: 5px;
  display: inline-block; 
}
h2 {
  font-size: 1.5rem;
  font-weight: 700;
}
img {
    width: 100%; 
    height: auto; 
    object-fit: cover;
}
.city-img {
  filter: grayscale(100%);
  transition: all 0.5s ease-in-out;
}
.city-img.paris:hover {
  filter: grayscale(0%) hue-rotate(45deg);
}
.city-img.nyc:hover {
  filter: grayscale(0%) hue-rotate(90deg);
}
.city-img.shanghai:hover {
  filter: grayscale(0%) hue-rotate(135deg);
}
.city-img.bogota:hover {
  filter: grayscale(0%) hue-rotate(180deg);
}
.city-img.london:hover {
  filter: grayscale(0%) hue-rotate(225deg);
}
.city-img.istanbul:hover {
  filter: grayscale(0%) hue-rotate(270deg);
}
figcaption {
  text-align: left;
}
footer {
  font-weight: 300;
  color: #555;
  font-size: 1.175rem;
  font-style: italic; 
}
@media (max-width: 600px) {
  .container {
    flex-direction: column;
    align-items: center;
  }
  .box {
    width: 90%;
    margin-bottom: 20px;
    text-align: left;
  }
  h1 {
    font-size: 3rem;
  }