a{
    color: white;
}
body{
    background-image: url("Night-sky-2.jpg");
    background-size: cover;
}
ins{
    color: wheat;
}
h1{
    text-align: center;
    color: black;
    text-decoration: underline;
}
h2{
    color: white;
}
ul.vertical{
    color: aqua;
}
button{
    border: none;
    padding: 10px 20px;
    border-radius: 12px;
    font-size: 16px;
    background-color: blue;
}
ul.horizontal{
    text-align: center;
    background-color:black;
    padding: 10px;
    margin: 0;
}
.custom-button{
    padding: 57px;
    border: none;
    cursor: pointer;
    height: 5px;
    width: 50px;
    align-items: center;
    background-color: rgb(101, 101, 253);
    border-radius: 46px
}
.show{
    display: inline;
}
.hide{
    display: none;
}
li.horizontal a:hover {
    background-color: #3399ff;
}
ul.horizontal {
    list-style-type: none;
    margin: 0;
    padding: 0;
    background-color: black;
    overflow: hidden;
    display: flex;
    justify-content: center;
    background-color:black;
    padding: 10px;
    margin: 0;
}
li.horizontal a {
    display: inline;
    color: white;
    text-align: center;
    padding: 14px 20px;
    text-decoration: none;
    transition: background 0.3s;
    margin: 0 19px;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

h1 {
    font-size: 2.5rem;
    margin: 20px 0;
    animation: fadeIn 1s ease-out;
}