body {
    background-color: #f2f2f2;
    font-family: Arial, sans-serif;
}

/* BOX 1 */
.box1 {
    width: 400px;
    padding: 10px;
    margin: 30px;
    border: 3px solid #ff69b4;
    background-color: #ffe4f2;
}

/* BOX 2 */
.box2 {
    width: 400px;
    padding: 30px;
    margin: 50px;
    border: 5px dashed #4a90e2;
    background-color: #d6ecff;
}

/* BOX 3 */
#box3 {
    width: 400px;
    padding: 5px;
    margin: 50px;
    border: 4px double #2ecc71;
}

/* BOX 4 */
.box4 {
    width: 400px;
    padding: 30px;
    margin: 50px;
    border: 5px dashed #4a90e2;
    background-color: #d6ecff;

    /* Added box-sizing */
    box-sizing: border-box;
}