*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

body{
    padding: 10px;
    background-color: darkgray;
}

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

.flex1{
    width: 540px;
    align-self: center;

}

.flex2{
    width: 540px;
    align-self: center;

}

.flex3{
    width: 540px;
    align-self: center;

}

.flex4{
    width: 540px;
    align-self: center;

}