html,
body {
    font-family: sans-serif;
}

.panel {
    background-color: gold;
}

.bars {
    color: blueviolet;
    margin: 35px 29px;
}

#close {
    margin: 35px 29px;
    color: blueviolet;
    display: none;
}

.menu a {
    text-decoration: none;
    font-size: 16px;
    font-weight: bold;
    color: blue;
}

.menu {
    list-style-type: none;
    font-size: 16px;
    margin: 0px 25px;
}

.menu a:hover {
    color: white;
    background-color: blue;
    transition: 0.5s ease background;
}

.menu a:focus {
    color: white;
    background-color: blue;
}

.export {
    margin: 50px 0px;
    padding: 30px 0px;
    background-color: rgb(255, 230, 0);
    color: navy;
}

.content-images {
    margin: 50px 0px;
}

#title {
    padding: 20px 0px;
}

.card {
    box-shadow: 0 0 9px 0px #0000003d;
    padding: 5px;
}

#btntop {
    position: fixed;
    bottom: 40px;
    right: 40px;
    color: tomato;
    display: none;
    z-index: 1;
    cursor: pointer;
}

#btntop:hover{
    animation: 0.5s btn infinite;
}

@keyframes btn{
    0%{
        margin: 5px 0px;
    }
    100%{
        margin: -1px 0px;
    }
}

@media (min-width: 320px) and (max-width:480px) {
    h1 {
        font-size: 28px;
    }

    h3 {
        font-size: 17px;
    }

    h4 {
        font-size: 13px;
    }

    #contact-info {
        font-size: 7px;
    }

    #contact-icon {
        color: orange;
        font-size: 8px;
    }
}

@media (max-width: 400px) {
    h1 {
        font-size: 28px;
    }

    h3 {
        font-size: 17px;
    }

    h4 {
        font-size: 13px;
    }

    #contact-info {
        font-size: 7px;
    }

    #contact-icon {
        color: orange;
        font-size: 8px;
    }
}