* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
 
/*-------------header --------------*/


       
/*-------------ABOUT--------------*/


img{
    width: 100%;
}

.presentation{
    margin-top: 100px;
}

.button {
  display: inline-block;
 padding: 20px;
  font-size: 16px;
  font-weight: bold;
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: 5px;
  width: 60%;
  cursor: pointer;
  color: black;
  background-color: #3468C0; 
  transition: background-color 0.3s ease;
margin-bottom: 50px;
margin-top: 30px;
}

.button:hover {
  background-color: black;
  text-decoration: none;
  color: white;
}

.button:active {
  transform: translateY(1px); 

}


.col-md-4 img{
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 50%;
}

.col-md-4 p {
    background-color: white;
    text-align: left;
    background-color: lightgray;
}

.col-md-4 {
    text-align: center;
    background-color: lightgray;
}


/*-------------footer--------------*/
.footer {
    background-color: #3468C0;
    padding: 30px 0;
    text-align: center;

}

.footer-menu {
    display: inline-block;
    margin: 0 20px;
}

.footer-menu a {
    display: block;
    width: 100px;
    height: 100px;
    background-size: cover;
    background-position: center center;
    font-size: 16px;
    text-decoration: none;
    line-height: 100px; 
    transition: background-color 0.3s ease;
}

/

@media screen and (max-width: 700px) {
    section {
        padding: 20px; 
    }

    img {
        width: 100%; 

    }

    .presentation {
        margin-top: 30px; 
    }

    .button {
        padding: 15px; 
        font-size: 14px; 
        width: 80%; 
        margin-top: 20px; 
        margin-bottom: 20px; 
    }

    .col-md-4 img {
        width: 70%; 
    }

      .footer {
        padding: 15px 0; 
    }

    .footer-menu {
        margin: 0 10px; 
        width: 40%;
    }

    .footer img{
        width: 5%;
    }

    .footer-menu a {
        width: 30px; 
        height: 30px; 
        line-height: 50px; 
    }
}