body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
   background-image: url('imagem/fundo.jpg');
   background-repeat: no-repeat;
   background-size: cover;
    overflow: hidden;

}

.container {
    font-size: 10px;
    width: 40em;
    height: 40em;
    position: relative;
}

.sol {
    position: absolute;
    top: 15em;
    left: 15em;
    width: 10em;
    height: 10em;
    background-color: yellow;
    border-radius: 50%;
    box-shadow: 0 0 3em rgba(255, 255, 255, 0.973);

}

.terra,
.lua {
    position: absolute;
    border-style: solid;
    border-color: white transparent transparent transparent;
    border-width: 0.1em 0.1em 0 0;
    border-radius: 50%;
}

.terra{
    top: 5em;
    left: 5em;
    width: 30em;
    height: 30em;
    animation: orbit 36.5s linear infinite;

}

.lua {
    top: 0;
    right: 0;
    width: 8em;
    height: 8em;
    animation: orbit 2.7s linear infinite;
}

.terra::before,
.lua::before {
    content: "";
    position: absolute;
    border-radius: 50%;
}

.terra::before {
    top: 2.8em;
    right: 2.8em;
    width: 3em;
    height: 3em;
    background-color: aqua;
}

.lua::before {
    top: 0.8em;
    right: 0.2em;
    width: 1.2em;
    height: 1.2em;
    background-color: silver;
}

@keyframes orbit {
to {
    transform: rotate(360deg);
}
}