body {
    background-image: linear-gradient(to right, #ABC8D3, #4A86A4);
    margin: 0;
    padding: 0;
    font-family: 'Arial', sans-serif;
}

.nav {
    list-style: none;
    margin: 0;
    padding: 0 0 20px 0;
    text-align: right;
    font: bold;
}

.nav > li {
    display: inline-block;
    padding: 0 20px;
    font-size: 16px;
}

.nav > li > a {
    text-decoration: none;
    color: #000;
}

.nav > li > a:hover,
.nav > li > a:focus {
    color: #ffffff;
}


.banner{
   width: 100%;
   display: block; 
}
.banner > .banner-image {
    width: 100%;
    height: 300px;
    display: block;
}


header {
    background-image: linear-gradient(to right, #4A86A4, #ABC8D3);
    text-align: center;
    padding: 20px 0 0 0 ;
    font-size: larger;
    font-family: Arial, Helvetica, sans-serif;
    font: bold;
}


.esimene,
.kolmas,
.neljas {
    background-image: linear-gradient(to left, #75A8C2, #C2D5DB);
    text-align: center;
    padding: 15px;
}

.teine,
.kolmas1 {
    padding: 0 20px;
}


iframe {
    display: block;
    margin: 20px auto;
    max-width: 100%;
    border: none;
    padding: 0;
}


.avatar {
    border-radius: 50%;
    margin: 20px auto;
    display: block;
    max-width: 300px;
    width: 100%;
    height: auto;
}


footer {
    background-image: linear-gradient(to left, #09708d, #4f585b30);
    text-align: center;
    padding: 20px 10px;
}


.flip-box {
  width: 100%;
  max-width: 300px;
  height: auto;
  aspect-ratio: 2 / 1;
  margin: 20px auto;
  border-radius: 20%;
  padding: 10px;
}

.flip-box-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.8s;
  transform-style: preserve-3d;
}

.flip-box:hover .flip-box-inner {
  transform: rotateX(180deg);
}

.flip-box-front,
.flip-box-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.flip-box-front {
  background-image: linear-gradient(to left, #09708d, #4f585b30);
  color: black;
}

.flip-box-back {
  background-image: linear-gradient(to left, #09708d, #4f585b30);
  color: black;
  transform: rotateX(180deg);
}


@media (max-width: 768px) {
    .nav {
        text-align: center;
    }

    .nav > li {
        display: block;
        padding: 10px 0;
    }

    header {
        font-size: 1.2rem;
    }

    .teine,
    .kolmas1 {
        padding: 0 10px;
    }
}

@media (max-width: 480px) {
    header {
        font-size: 1rem;
    }

    .avatar {
        max-width: 75%;
    }

    .flip-box {
        max-width: 90%;
    }
}