.block{
    background-color:red;
    width: 200px;
    height:200px;
    border: 1px solid black;
}

span{
    background-color: blue;
    width: 100px;
    height: 100px;
    display: block;
    border: 1px solid black;
}
.content{
display: flex;
height: 100%;
flex-direction: row;
justify-content: space-evenly;
}