body {
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-self: center;
    
}

div {
     justify-self: center;
}
.left {
    text-align: left;
}
.box {
    height: 100px;
    width: 300px;
    background-color: rgb(238, 238, 238);        
    font-size: 13pt;
    border: 3px solid black;
}