.t-slds__bgimg { 
    border: #8d628e 5px solid; 
    border-radius:30px;
}

.snow1{
   background-image: url(https://webtort.ru/wp-content/uploads/2019/12/snow1.png);
   position:absolute;
   width: 100%;
    height:600px;
    animation: snow1 18s linear infinite;    
}

.snow2{
    background-image: url(https://webtort.ru/wp-content/uploads/2019/12/snow2.png),url(https://webtort.ru/wp-content/uploads/2019/12/snow3.png);
    animation: snow2 10s linear infinite;
    width: 100%;
    height:600px;
    position:absolute;
}

@keyframes snow2{
    0%{background-position: 0 0, 0 0;}
    100%{background-position: 10% 600px, 10% 600px;}
}
@keyframes snow1{
    from{background-position: 0 -300px;}
    20% {background-position: 20% -100px;}
    40% {background-position: 30% 100px;}
    to{background-position: 20% 700px;}
}