style3.css

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

#nav {
    width: 100%;
    margin: 0;
    padding: 0;
    text-align: center;
    list-style: none;
    background-color: black;
    border-bottom: 1px solid #ccc;
    border-top: 1px solid #ccc;
}

#nav li {
    display: inline-block;
    text-align: center;
}

#nav li a {
    display: block;
    padding: 8px 15px;
    text-decoration: none;
    font-weight: 700;
    text-align: center;
    color: white;
    border-right: 1px solid black;
    font-size: 30px;
  background-color: black;
}

#nav li a:hover {
    color: white;
    text-align: center;
    background-color: purple;
}




* {
  box-sizing: border-box;
}

.bg-img {
  /* The image used */
  background-image: url("Images_nasa/Tech.jpg");
  
  /* Add the blur effect */
  filter: blur(5px);
  -webkit-filter: blur(7px);
  
  /* Full height */
  height: 100%; 
  
  /* Center and scale the image nicely */
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

/* Position text in the middle of the page/image */
.bg-text {
  background-color: rgb(0,0,0); /* Fallback color */
  background-color: rgba(0,0,0, 0.4); /* Black w/opacity/see-through */
  color: white;
  font-weight: bold;
  font-size: 50px;
  border: 3px solid #f1f1f1;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  width: 100%;
  padding: 40px;
  text-align: center;
}

 .heading3 {
   text-align: center;
  font-size: 50px;
 }

.container3 {
   margin-left: 820px;
}

 .info3 {
     font-size: 45px;
    text-align: center;
  }

.imgmarsrover {
  margin-left: 670px;
  
}