html {
    font-size: 62.5%;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.main-container {
    width: 100%;
    height: 100vh;
}
.container {
  
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    width: 100%;
    height: 100vh;
    transition: .4s;
    display: flex;
    align-items: center;
    justify-content: space-between;
    
}
.button {
    margin: 3rem;
    width: 5rem;
    height: 5rem;
    background-color: aliceblue;
    border-radius: 50%;
    opacity: .7;
    cursor: pointer;
    transition: .4s;
    font-size: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
}
.button:hover {
    opacity: 1;
}
img {
    width: 3rem;
}