style.css

html{
    box-sizing: border-box;
}
body{
    margin: 0;
    background: #45badd;
}
.container{
    height: 100vh;
    width: 100vw;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center; 
    background: url(./robot.gif);
    background-size: contain;
    background-position: left center;
    background-repeat: no-repeat;
}

button{
    cursor: pointer;
    outline: none;
    width: 180px;
    height: 50px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 17px;
    color: white;
    background: #ff3482;
    border: none;
    border-radius: 6px;
    box-shadow: 2px 2px 20px 9px rgba(0, 0, 0, 0.4);
}
button:hover{
    filter: brightness(95%);
}
button:active{
    transform: scale(0.98);
}
@media screen and (max-width:1000px) {
    .container{
        background-position: center center;
        background-size: cover;        
    }
    button{
    box-shadow: 2px 2px 20px 9px rgba(0, 0, 0, 0.8);
    }
}