* {
    box-sizing: border-box;
}

 /* For mobile phones: */
[class*="col-"] {
    width: 100%;
}
@media only screen and (min-width: 600px) {
    /* For tablets: */
    .col-s-1 {width: 8.33%;}
    .col-s-2 {width: 16.66%;}
    .col-s-3 {width: 25%;}
    .col-s-4 {width: 33.33%;}
    .col-s-5 {width: 41.66%;}
    .col-s-6 {width: 50%;}
    .col-s-7 {width: 58.33%;}
    .col-s-8 {width: 66.66%;}
    .col-s-9 {width: 75%;}
    .col-s-10 {width: 83.33%;}
    .col-s-11 {width: 91.66%;}
    .col-s-12 {width: 100%;}
}
@media only screen and (min-width: 768px) {
    /* For desktop: */
    .col-1 {width: 8.33%;}
    .col-2 {width: 16.66%;}
    .col-3 {width: 25%;}
    .col-4 {width: 33.33%;}
    .col-5 {width: 41.66%;}
    .col-6 {width: 50%;}
    .col-7 {width: 58.33%;}
    .col-8 {width: 66.66%;}
    .col-9 {width: 75%;}
    .col-10 {width: 83.33%;}
    .col-11 {width: 91.66%;}
    .col-12 {width: 100%;}
}

[class*="col-"] {
    float: left;
    padding: 15px;
    border: 1px solid red;
}

.row::after {
    content: "";
    clear: both;
    display: table;
}

html {
    font-family: "Lucida Sans", sans-serif;
}
.header {
    background-color: #ff0000;
    color: #ffffff;
    padding: 15px;
}
.menu ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
}
.menu li {
    padding: 8px;
    margin-bottom: 7px;
    background-color: yellow;
    color: #000000;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
}
.menu li:hover {
    background-color: #0099cc;
}

img {
    max-width: 100%;
    height: auto;
}

video {
    max-width: 100%;
    height: auto;
}

 /* Extra small devices (phones, 600px and down) */
@media only screen and (max-width: 600px) {...}

/* Small devices (portrait tablets and large phones, 600px and up) */
@media only screen and (min-width: 600px) {...}

/* Medium devices (landscape tablets, 768px and up) */
@media only screen and (min-width: 768px) {...}

/* Large devices (laptops/desktops, 992px and up) */
@media only screen and (min-width: 992px) {...}

/* Extra large devices (large laptops and desktops, 1200px and up) */
@media only screen and (min-width: 1200px) {...} 

@media only screen and (orientation: landscape) {
    body {
        background-color: white;
    }
}

/* If the screen size is 600px wide or less, hide the element */
@media only screen and (max-width: 600px) {
  div.hide {
    display: none;
  }
}

/* If the screen size is 601px or more, set the font-size of <div> to 70px */
@media only screen and (min-width: 601px) {
  div.font {
    font-size: 70px;
  }
}

/* If the screen size is 600px or less, set the font-size of <div> to 25px */
@media only screen and (max-width: 600px) {
  div.font {
    font-size: 25px;
  }
}

 /* Container holding the image and the text */
.container {
    position: relative;
    text-align: center;
    color: white;
}

/* Bottom left text */
.bottom-left {
    position: absolute;
    bottom: 8px;
    left: 16px;
}

/* Top left text */
.top-left {
    position: absolute;
    top: 8px;
    left: 16px;
}

/* Top right text */
.top-right {
    position: absolute;
    top: 8px;
    right: 16px;
}

/* Bottom right text */
.bottom-right {
    position: absolute;
    bottom: 8px;
    right: 16px;
}

/* Centered text */
.centered {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}