html, body{
    height: 100%;

}

body{
    margin: 0;
    background: url("img/future.jpg")  no-repeat center center fixed;
    background-size: cover;

}


.main{
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;

}
.null{
    margin: 0px 1px;
}
.main_sector{
    display: flex;
    justify-content: center;

}
.main_block{
    max-width: 700px;
}
.main_block img{
    max-width: 100%;
}

.main_block audio{
    min-width: 375px;

}
audio {
    filter: grayscale(100%) contrast(100%) invert(100%);
    width: 200px;

}