apod.css

body, html {
  margin: 0;
}

.background {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    180deg,
    rgb(29, 41, 72) 0%,
    rgb(19.87, 28.61, 51.14) 24.82%,
    rgb(15, 22, 40) 38.08%,
    rgb(5, 10, 22) 100%
  );
}

.navbar {
  display: flex;
  justify-content: space-between;
  color: #fff;
  width: 80%;
  height: 85%;
  margin-top: 3%;
  font-family: "Satoshi-Regular", Helvetica;
  color: #ffffff;
  font-size: 15px;
}

.text {
  opacity: 0.75;
}

.text1 {
  display: flex;
  font-size: 27px;
  letter-spacing: 5.7px;
  z-index: 1;
}

.apod_image {
  display: flex;
  position: relative;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  margin-top: 3%;
  max-width: 70%;
}

.image {
  flex: 1;
  position: relative;
}

.info {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  width: 80%;
  text-align: center;
  font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}

.overlay {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  opacity: 0;
  background-color: rgb(0, 0, 0);
  border-radius: 2%;
  transition: opacity 0.3s ease-in-out;
}

.apod_image:hover .overlay,
.info:hover + .overlay {
  opacity: .3;
}

.overlay:hover + .info,
.info:hover {
  opacity: 1; 
}