header {
    width: 100%;
    height: 40px;
    padding: 10px;
    background-color: lemonchiffon;
    position: fixed;
    top: 0;
    display: flex;
    align-items: center;
}
a {
    text-decoration: none;
    color: black;
}
ul{
    list-style: none;
    margin: 0;
    display: flex;
}
li{
    margin: 0 0 0 25px;
    font-size: 25px;
}
body {
    padding-top: 40px;
    margin: 30px;
    background-color: lemonchiffon;
}
button{
    background-color: red;
    color: white;
}
.slot{
    margin: 0 auto;
    text-align: center;
    font-size: 30px;
}
.w33{
    width: 33%;
    text-align: center;
}
.w100{
    width: 100%;
    text-align: center;
}