.container{
    width: 1000px;
    margin: 0 auto;
    padding: 0 15px;
}
h1, h2, p{
    text-align: center;
}
.first__img{
    display: block;
    margin: 0 auto;
     height: 500px;
     width: 1000px;
}
img{
    width: 300px;
    height: 300px;
}
ul{
    display: flex;
    justify-content: space-between;
}
li{
    list-style: none;
}