html,div,body,article{
margin: 0;
}

.wrap{
width: 100%;
height: 100vh;
border: solid 10px #ffffff;
box-sizing:border-box;
}
 
.vt01 {
position: fixed;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
bottom: 0;
min-width: 100%;
min-height: 100%;
width: auto;
height: auto;
z-index: -100;
background: url('poster.jpg') no-repeat;
background-size: cover;
}
 
.bg-white {
position: relative; /*必ず必要*/
z-index: 2; /*必ず必要*/
top: 10%;
display: flex;
width: 50%;
justify-content: center;
align-items: center;
text-align:center;
margin: auto;
}