body, html {
    margin: 0;
    font-family: sans-serif;
    background-color: azure;
}

.content {
    margin: 0 auto;
    width: 800px;
}

table, td, th {
    border: 1px solid #aaa;
}

table {
    border-collapse: collapse;
    width: 100%;
}

th {
    height: 30px;
}

td {
    text-align: center;
    padding: 5px;
}

.form {
    margin-top: 20px;
}

#content {
    width: 80%;
}

hr.thick_red {
  border: 1px solid red;
}

hr.thick_black {
  border: 3px solid black;
  border-radius: 5px;
  margin-top: 25px;
  margin-bottom: 25px;
}

hr.dashed_black {
  border-top: 3px dashed black;
  margin-top: 20px;
  margin-bottom: 20px;
}

hr.dotted_pink {
  border-top: 5px dashed pink;
}

hr.solid_red {
  border-top: 1px solid red;
}

/* Dashed red border */
hr.dashed_red {
  border-top: 1px dashed red;
}

/* Dotted red border */
hr.dotted_red {
  border-top: 1px dotted red;
}

/* Thick red border */
hr.thick_red {
  border: 1px solid red;
}

/* Large rounded green border */
hr.thick_green_rounded {
  border: 10px solid green;
  border-radius: 5px;
}