body {
    background: #00ff00;
    min-height: 100vh;
    overflow: hidden;
}



#indx {

    background: #00ff00;
    min-height: 100vh;

    display: flex;

    justify-content: center;
    align-items: center;



}

.cross {
    position: fixed;

    width:100px;
    height: 100px;

    content:"x";

    display: flex;
    justify-content: center;
    align-items: center;

    background: url(crss.png) center no-repeat;
    background-size: cover;

}

.tl {
 top: 0;
 left: 0;
}

.tr {
    top: 0;
    right: 0;
}

.bl {
    bottom: 0;
    left: 0;
}

.br {
    bottom: 0;
    right: 0;
}

.c {
    position: static;
}