body {
    font-family: Arial, Helvetica, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background-image: url(bck.jpg);
    background-position: center center;
    background-size: cover;
}
.conatiner{
    flex-direction: column;
    width: 55%;
}
.tabs {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 20px;
}

.tabs li {
    padding: 10px;
    background-color: #f6f4f4;
    border-right: 1px solid white;
    cursor: pointer;
    transition: 0.2s;
}

.tabs li.active,
.tabs li:hover {
    background-color: #ddd;
}

.content {
    background-color: #ddd;
    font-size: 20px;
}

.content>div {
    padding: 20px;
}

.content>div:not(:first-child) {
    display: none;
}

@media only screen and (max-width : 775px){
    .conatiner{
        width: 85%;
    }
}