body {
  font-family: Arial;
  font-size: medium;
  margin: 20px 40px 10px 40px;
}
.pix1 {
        border-top: 1px solid black;
        border-left: 1px solid black;
        border-collapse: collapse;
}
.pix1 th, .pix1 td {
        border-right: 1px solid black;
        border-bottom: 1px solid black;
        padding: 5px;
}
.yellowbox {
    border: 1px solid black;
    background: yellow;
    padding: 20px 20px 20px 20px;
    font-weight: bold;
    width: 350px;
}