style.css

*{
    margin: 0%;
    padding: 0%;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
}

body{
background-color:aquamarine;
}
.nave ul{
    background-color: #007bff;
    width: 100%;
    height: 100%;
    display: flex;
    list-style: none;
    align-items: center;
    justify-content: flex-end;
}
.nave a:hover{
    background-color: gainsboro;
    color: blue;
}
.nave a{
    padding: 20%;
    font-weight: bold;
    text-decoration: none;
    color: black;
    font-size: medium;
    font-weight: 400;
}
.nave li{
    height: 5%;
    padding: 1%;
    margin: 1%;
}
nav li:first-child{
    margin-right: auto;
}
/* blank */


.A{
    margin: 15px 70px;
    padding: 30px;
    border-width: 3px;
    border-style: solid;
    border-color: blue;
}
.A h3{
    display: flex;
    align-content: center;
    justify-content: center;
    background-color: beige;
}

.B{
    background-color: beige;
    margin-top: 10%;
    margin-right: 50%; margin-left: 5%;
    padding: 150px;
    border-width: 3px;
    border-style: solid;
    border-color: blue;
}
#assistant {
    margin-bottom: 6%;
    background-color: beige; padding: 5%; 
    border-width: 2px; border-style: solid; border-color: black;
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
}

#animation {
    width: 50px;
    height: 50px;
    background-color: #007bff;
    border-radius: 50%;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.5);
        opacity: 0.5;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

#start-button {
    margin-top: 10px;
    padding: 10px;
    border: none;
    background-color: #007bff;
    color: white;
    cursor: pointer;
}