nsi/Activity_PHP/calendar/style.css

table {
   margin-top: 30px;
   border-collapse: collapse;
   width: 100%;
}

th, td {
   border: 1px solid #dddddd;
   text-align: left;
   padding: 8px;
}

th {
   background-color: #f2f2f2;
}

.today {
   background-color: rgb(202, 0, 0);
}

* {
   margin: 0;
   padding: 0;
   box-sizing: border-box;
}

body {
   font-family: Arial, sans-serif;
   line-height: 1.6;
   background-color: #f4f4f4;
   margin: 0;
   padding: 0;
}

header {
   background-color: #333;
   color: #fff;
   text-align: center;
   padding: 1em 0;
}

header h1 {
   margin: 0;
}

form {
   margin-top: 20px;
   text-align: center;
}

form label {
   margin-right: 10px;
}

form input,
form select {
   width: 100px;
   padding: 5px;
   margin-right: 10px;
}

form button {
   padding: 7px 15px;
   background-color: #292929;
   color: #fff;
   border: none;
   cursor: pointer;
}

main {
   max-width: 800px;
   margin: 20px auto;
   padding: 20px;
   background-color: #fff;
   border-radius: 5px;
}

main section {
   margin-bottom: 20px;
}

main h2 {
   margin-bottom: 10px;
}

main p {
   color: #555;
}