html, body {
    min-width: 320px;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    line-height: 30px;
    padding: 0;
    margin: 0;
    background-color: #dedada;
}

/* ------ header, footer start ----- */
header, footer {
    width: 1000px;
    background-color: #fff;
    margin: 10px auto;
    padding: 10px;
}
header h1 {
    color: #3f953f;
    text-align: center;
}


footer {
    text-align: center;
    color: #828686;
}

/* ------ header, footer end ----- */

/* ------ main start ----- */
main {
    width: 1000px;
    margin: 0 auto;
    padding: 10px;
    background-color: #fff;
}
/* ------ main end ----- */


/* ------ canvas start ----- */
#lego {
    width: 400px;
    height: 400px;
    background-color: #eeeeee;
    margin: 10px 0;
}
/* ------ canvas end ----- */

/* ------ button styles start ----- */
button {
    padding: 5px;
    margin: 5px;
    width: 100px;
    background-color: #8dcd30;
    border: 1px solid #007900;
    color: #000000;
}

button:hover{
    background-color: #fff;
    border: 1px solid #000;
    cursor: pointer;
}
/* ------ button styles end ----- */


/* ------ delete margin left ----- */
.ml0 {
    margin-left: 0;
}

.mid {
    display: flex;
    justify-content: center;
}