mask path{
fill:none;
stroke:#ffffff;
stroke-width:7;
stroke-dasharray: 1800px;
stroke-dashoffset: 1800px;
animation: line 8s 2s forwards;
}

@keyframes line{
0%{stroke-dashoffset: 1800px;}
100%{stroke-dashoffset: 0;}
}

svg{
width:100%;
}

#layer_1{
mask: url(#out);
stroke: #000;
}