.main-body{
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    margin: 20px auto;
    width: 90%;
}
#card-body{
    background-color: aliceblue;
    width: 29%;
    padding: 10px 15px;
    margin: calc(13%/6);
}
#img{
    width: 90%;
    display: block;
    margin: auto;
}
#btn_grp{
    display: flex;
    justify-content: space-between;
}
#btn_grp button{
    outline: none;
    border: none;
    border-radius: 7px;
    padding: 5px 7px;
}