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

body{
  text-align: center;
  background-color: white;
  font-family: 'Zilla Slab', serif;
  font-size: 18px;
  color: white;
  min-width: 870px;
}

.flex-column{
  display: flex;
  flex-direction: column;
}

.text-decoration-none{
  text-decoration: none;
}

/* nav */
#nav{
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color:black;
  height: 70px;
  padding: 0 30px;
}

#nav span{
  font-family: 'Monoton', cursive;
  color: orangered;
  font-size: 30px;
  font-weight: 500;
}

#nav-right{
  display: flex;
  align-items: center;
}

#nav-right-first a{
  padding: 2px 15px;
  color: white;
}

#nav-right-first a:hover{
  color: rgb(168, 166, 166);
}

#nav-right-second input{
  border-radius: 5px;
}

#nav-right-second a{
  color: white;
}

#nav-right-second a:hover{
  color: rgb(168, 166, 166);
}

.border-right{
  border-right: 1px solid white;
}

#input-height{
  height: 30px;
}

/* header-image */
#header-image{
  background-image: url('img/iStock-1362060571.jpg');
  background-size: cover;
  background-position: center;
  height: 700px;
  position: relative;
}

#header-image-paragraph1{
  position: absolute;
  width: 450px;
  right: 30px;
  top: 30px;
}

#header-image-paragraph2{
  position: absolute;
  width: 300px;
  left: 30px;
  bottom: 30px;
  font-size: 50px;
}

/* main */
#main{
  background-color: rgb(29, 28, 28);
  display: flex;
  flex-direction: column;
  align-items: center;
}

#main-text{
  align-items: center;
  height: 200px;
}

#main-text p{
  width: 800px;
  margin: 50px 0;
}

#main-text input{
  padding-left: 10px;
  font-weight: bold;
}

#calculation input{
  height: 40px;
  border-radius: 5px;
  margin-right: 15px;
  border: none;
  font-family: 'Lato', sans-serif;
  font-size: 16px;
}

#calculation button{
  height: 42px;
  border-radius: 5px;
  padding: 0 10px;
  background-color: rgb(211, 58, 3);
  color: white;
  font-size: 16px;
}

/* grid-container */
#grid-container{
  display: grid;
  grid-template-columns: auto auto auto auto auto;
  place-items: center;
  row-gap: 50px; 
  column-gap: 30px;
  margin:60px 0;
}

.planets{
  width: 150px;
  background-color: black;
  border-radius: 5px;
}

.planets h3{
  margin: 15px 0;
}

.planets p{
  font-family: 'Lato', sans-serif;
  padding: 5px 0;
  height: 30px;
  background-color: white;
  color: black;
  font-weight: bold;
  border-radius: 5px;
  margin-top: 15px;
  font-size: 16px;
}

/* footer */
.footer{
  color: white;
  background-color: black;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100px;
  font-family: 'Lato', sans-serif;
}

.footer i{
  font-size: 13px;
  margin-right: 5px;
}