.picture {
position: fixed;
top: 0;
left: 0;
right: 0;
width: 100%;
height: 100vh;
height: 100svh;
background-size: cover;
background-repeat: no-repeat;
background-position: top;
opacity: 0;
transition: 0.6s all;
}
.picture_style_1 {
background-image: url('../img/main-1.jpg');
opacity: 1;
}
transition: all 0.6s;