@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100..900;1,100..900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100..900;1,100..900&family=Space+Mono:ital,wght@0,400;0,700;1,400;1,700&display=swap');
body{
    margin: 0px;
    background-color: black;
    color: white;
}
header{
    text-align: center;
    background-color: blue;
    text-decoration: italic;
    font-style: italic;
    padding: 20px;
}
span{
    color: yellow;
}
footer{
   padding: 20px; 
   background-color: blue;
   display: flex;
   justify-content: space-around;
}
.planetes article img{
    margin: 40px;
    width: 400px;
    opacity: 0.5;
}
.grostitre{
    text-align: center;
}
.systeme_solaire{
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.planetes article img:hover{
    opacity: 1;
    transform: scale(1.2);
    transform: rotate(5deg);
    transition: ease;
}
.planetes{
    display: flex;
    flex-wrap: wrap    
}