.center{
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 40%;
    height: 40%
}
.center_text{
    display: block;
    margin-left: 300px;
    margin-right: 300px;
    text-align: center;
    font-size: 23px;
}
body{
    background:#045c41
}
.center_header{
    display: block;
    margin-left: 300px;
    margin-right: 300px;
    text-align: center;
    font-size: 30px;
}