body {
   font-family: Arial, sans-serif;
   margin: 20px;
}
.container {
   margin: 0 auto;
   max-width: 800px;
}
table {
   border-collapse: collapse;
   margin-bottom: 20px;
   width: 100%;
}
th,
td {
   border: 1px solid #ddd;
   padding: 10px;
   text-align: center;
}
th {
   background-color: #f4f4f4;
}
.beschikbaar {
   background-color: #d4edda;
}
.volgeboekt {
   background-color: #f8d7da;
}
.formulier {
   margin-top: 20px;
}
label {
   display: block;
   margin-bottom: 8px;
}
input,
select,
textarea {
   margin-bottom: 16px;
   padding: 8px;
   width: 100%;
}
.error {
   color: red;
}
body {
   background-color: #4F4F4F;
   color: #000000;
   font-family: Arial;
   font-size: 16px;
   font-weight: normal;
   line-height: 1.1875;
   margin: 0;
   padding: 0;
}