body {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 14px;
}
h1 {
    text-align: center;
    margin-top: 20px;
}

a {
    float: right;
    margin: 10px;
}
a:link {
  color: black;
  text-decoration: none;
}
a:visited {
  color: black;
  text-decoration: none;
}
a:hover {
  color: black;
  text-decoration: underline;
}
a:active {
  color: black;
  text-decoration: none;
}

.ab {
    background-color: blue;
    color: white;
    font-weight: bold;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    vertical-align: middle;
    margin-top: 10px;
}

.bar {
    width: 400px;
    height: 35px;
    border-radius: 24px;
    border: 1px solid black;
    display: flex;
    justify-content: center;
    align-items: center;
}
.btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 4px;
    border: 1px solid black;
    background: white;
    font-size: 14px;
    margin-top: 10px;
    margin: 10px;
}
.btn-center {
    display: flex;
    justify-content: center;
    align-items: center;
}
.bar-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

label {
    display: inline-block;
    width: 200px;
    text-align: left; 
    vertical-align: middle;
    margin-top: 10px;
}

.af {
    width: 400px;
    padding: 2px;
    border: 1px solid black;
    border-radius: 4px;
    vertical-align: middle;
    margin-top: 10px;
}