*{
    box-sizing: border-box;
    margin: 0;
}
.big{
    margin: auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin: 20px;
    border: 5px solid red;

}
.first{
    width: 32%;
    border: 3px solid blue;
    background-color: yellow;
}
.second{
    width: 32%;
    border: 3px solid blue;
    background-color: yellow;
}
.third{
    width: 32%;
    border: 3px solid blue;
    background-color: yellow;
}
.div1{
    margin: 5px;
    padding: 10px;
}
.btn{
    background-color: black;
    color: whitesmoke;
    margin-top: 10px;
    border-radius: 7px;
    transition: 0.1s all linear;
}
.btn:hover{
    transform: translate(-5px , 5px);
}
.pic{
    vertical-align: middle;
}