html {
    background-color: #90aede;
    color: black;
    padding: 20px;
}
.header {
    font-size: 24px;
    text-align: center;
}
.main-container {
    padding: 10px;
    margin-top: 20px;
}
ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    width: 200px;
    background-color: #f1f1f1;
    border: 1px solid #555;
    border-radius: 5%;
}

li a {
    display: block;
    color: black;
    padding: 8px 16px;
    text-decoration: none;
}
.table {
    width: 100%;
    border: 1px solid black;
    border-collapse: collapse;
    padding: 12px;
    border-radius: 5%;
    display: flex;
}
.table th  {
    border: 2px solid black;
    padding: 10px;
    border-radius: 20%;
    text-align: center;
    background-color:#8df084 ;
}

.table td {
    border: 2px solid red;
    padding: 12px;
    border-radius: 50%;
    vertical-align: middle;
    text-align: center;
    transition: background-color 0.3s ;
}
td:hover {
    background-color: 
    white;background-color: #555555;
}
li a:hover {
    background-color: #555;
    color: white;
}