body {
    margin: 0px;
    padding: 0px;
    
    font-family:"Roboto", 'IBM Plex Sans', Tahoma, Geneva, Verdana, sans-serif;
    
    box-sizing: border-box;
    letter-spacing: 1px;
    text-wrap: wrap;
    
    
}


.introduction_card img {

    width: 100%;
    

}

details {
  
    border-top: 1px solid #ddd;
    border-left: 1px solid #ddd;
    border-right: 1px solid #ddd;

    padding: 1rem;
}

details:last-child {
    
    border-bottom: 1px solid #ddd;
    padding: 1rem;


}

details>summary img.icon {
    width: 24px;
    height: 24px;
    transition: all 0.3s;
    margin-left: auto;
    align-self: center;
}

details[open] summary span.icon {
    transform: rotate(180deg);

}

details[open] summary {

    border-bottom: 1px solid #ddd;
}

summary {
    display: flex;
    cursor: pointer;
    align-items: first baseline;


}

summary::-webkit-details-marker {
    display: none;
}

@media (max-width:750px) {
    .logo {
        padding-left: 0px;
    }


    .navmenu {
        display: none;
    }

    .hamburger {
        display: inline;
        padding: 5px;
        border: 1px solid #f1f1f1;
    }

    .section_container {
        width: 100%;
    }


    .introduction_card_inner img{
        width: 100%;
        height: auto;
    }


}