#welcome_window {
    position: relative;
    text-align: center;
    color: white;
    font-family: Poppins, 'Times New Roman', Times, serif;
    display: grid;
    place-items: center;
    font-size: xx-large;
    text-shadow: 2px 1px 5px #000000;
    background-color: rgba(152, 152, 152, 0.5);
}
#welcome_window img{
    width: 100vw;
    max-width: 1280px;
    opacity: 0;
}
#welcome_window img.opaque {
    opacity: 1;
    transition: opacity 1500ms cubic-bezier(0.4, 0, 0.2, 1)
}
#welcome_titles {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

@media screen and (max-width: 768px){
    #welcome_window{
        font-size: large;
    }
}