*
{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body
{
  min-height: 100vh;
  background: #0c192c;
  font-family: Arial, sans-serif;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #15335f;
  padding: 10px 20px;
}

.logo {
  font-size: 24px;
  font-weight: bold;
  color: black;
}

nav {
  display: flex;
  gap: 20px
}

nav a {
  font-size: 18px;
  text-decoration: none;
  color: black;
  padding: 5px 10px;
  border: 2px solid black;
}

nav a:hover {
  background-color: black;
  color: white;
  transition: background-color 0.3s ease;
}
.container
{
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: auto;
}
.bubbles
{
  z-index: -100;
  position: fixed;
  display: flex;
}
.bubbles span
{
  position: relative;
  width: 30px;
  height: 30px;
  background: #4fc3dc;
  margin: 0 4px;
  border-radius: 50%;
  box-shadow: 0 0 0 10px #4fc3dc44,
  0 0 50px #4fc3dc,
  0 0 100px #4fc3dc;
  animation: animate 15s linear infinite;
  animation-duration: calc(125s / var(--i));
}
.bubbles span:nth-child(even)
{
  background: #ff2d75;
  box-shadow: 0 0 0 10px #ff2d7544,
  0 0 50px #ff2d75,
  0 0 100px #ff2d75;
}
@keyframes animate
{
  0%
  {
    transform: translateY(100vh) scale(0);
  }
  100%
  {
    transform: translateY(-10vh) scale(1);
  }
}
.center
{
  margin-left: auto;
  margin-right: auto;
}
h1
{
  text-align: center;
  margin-top: 2%;
  color: white;
}
h2
{
  text-align: center;
  color: white;
}
#image-container
{
    display: flex;
    justify-content: center;
}
#random-cat-image
{
    max-width: 600px;
    max-height: 360px;
    object-fit: cover;
}