body{
    background-color:  rgb(13, 6, 20);
    color: rgb(182, 255, 123);
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}

ul{
    display: flex;
    justify-content: space-around;
    list-style-type: none;
}

header img{
    width: 1250px;
    height: 550px;
    border-radius: 50px ;
    border: 6px solid rgba(21, 255, 0, 0.726);
}

.center{
    text-align: center;
}
.aviso{
    color: yellow;
    font-family: Arial, Helvetica, sans-serif;
    font-size: x-small;
    padding: 20px;
}

nav a{
    appearance: button;
    padding: 6px 8px;
    background-color: greenyellow;
    border: none;
    color: black;
    text-decoration: none;
    text-align: center;
}

h4{
    text-align: center;
}

nav a:hover{
    color: white;
}

.shild img{
    width: 40px;
    height: 40px;
    padding-left: 650px;
}