/* Google fonts -> 
    najdu si ROBOTO
    -> GET FONT
    -> GET EMBED CODE
    @import  */
@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100;0,300;0,400;0,500;0,700;0,900;1,100;1,300;1,400;1,500;1,700;1,900&display=swap');

body {
    font-family: "Roboto", sans-serif;
    font-weight: 300;
    padding: 10px;
    background-color: rgb(214, 214, 214);
}

.header {
    text-align: center;
    padding: 5px 0px;
    background-image: linear-gradient(45deg,#d4d4d4,#4279a3);
    margin-bottom: 10px;
    border-radius: 20px;
    transition: 0.5s;
}

.header:hover{
    opacity: 0.8;
    box-shadow: 5px 5px 10px black;
}

.topnav {
    overflow:hidden;
    background-image: linear-gradient(30deg, #232526,#43474a);
    border-radius: 10px;
    transition: 0.4s;
}

.topnav:hover{
    box-shadow: 5px 5px 10px black;
    opacity: 0.8;
}

.topnav a{
    color: whitesmoke;
    text-decoration: none;
    float: left;
    display:block;
    padding: 5px 10px;
    transition: 0.5s;
}

.topnav a:hover{
    background-color: #ddd;
    color:black;
}
.container:after{
    clear:both;
    display: table;
}
.card {
    padding: 20px;
    margin-top: 20px;
    background-color: white;
}
.footer {
    background-color: #ddd;
    text-align: center;
    padding: 20px;
    margin-top: 20px;
}
/* animace @keyframe uděla animaci a poté v třídě musíme nastavit spouštěče */
@keyframes example {
    0% {color: #FF0000}
    35% {color: #0000ff}
    65% {color: #00ff00}
    1000% {color: #7b00ff}
}
.secret {
    color: black;
    animation-name: example;;
    animation-duration: 2s;
    animation-iteration-count: infinite;
    animation-direction: alternate;
}