.tablink {
    float: left;
    border: none;
    outline: none;
    padding: 12px 16px;
    background-color: #0081cb;
    width: 25%;
    cursor: pointer;
    color: #ffffff;
}

.tablink:hover {
    background-color: #0081cbaa;
}

.tab-content {
    color: #ffffff;
    display: none;
    padding: 50px;
    text-align: center;
    height: 100%;
}

#london {
    background-color: red;
}

#paris {
    background-color: green;
}

#tokyo {
    background-color: blue;
}

#oslo {
    background-color: orange;
}