*,
html {
    margin: 0;
    padding: 0;
}

body {
    background-color:rgb(21, 21, 21) ;
    min-height: 100%;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;
    background-size: cover;
}

.content-1 {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 50vh;
}

.a-content {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.img-content-1 {
    width: 35%;
    height: 70%;
}