body {
    margin: 0px;
    font-family: sans-serif;
}

.cabecalho {
    background: linear-gradient(45deg, #fff, rgb(25, 13, 190));
    padding: 15px;
}

.menu {
   display: flex;
   justify-content: center;
   margin: 10px 0px;
}

.menu a {
    text-decoration: none;
    font-weight: bold;
    color: blue;
    margin-right: 15px;
    margin-left: 15px;
    border: 1px solid blue;
    border-radius: 5px;
    padding: 5px;
    margin-top: 10px;
}

.menu a:hover {
    color: white;
    background: #3421dd;
    transition: 0.6s ease-in-out;
}