body {
    background-color: aliceblue;
    font-family: Rubik, Arial;
    margin: 0px;
}

.header {
    background-color: rgb(0, 0, 51);
    color: white;
    display: flex;
    height: 40px; 
    padding: 20px;
}


.topnav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
}

.topnav ul li {
    float: left;
}
  
.topnav ul li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

.topnav ul li a:hover {
    background-color: #111;
}

.func {
    padding: 10px;
}

.func input {
    border: 1px solid #ccc;
    box-sizing: border-box;
    display: inline-block;
    margin: 8px 0;
    padding: 12px 20px;
    width: 90%;
}

button {
    background-color: #499df8;
    border: 20px;
    color: #fff;
    cursor: pointer;
    margin-top: 10px;
    padding: 10px;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

button:hover {
    opacity: 0.8;
}