style.css

img {
    width: 300px;
    height: 150px;
    margin: 10px;
    border-radius: 45%;
    transition: all 2s;
}
img:hover {
    transform: scale(1.1);
}
header nav img {
    width: 150px;
    height: 150px;
    float: left;
}
body,
html {
  width: 100%;
  height: 100%;
  font-family: 'Montserrat', sans-serif;
  background: url("background_ikherkhe.jpg") no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  color: white;
}
.buffer {
    height: 50px;
  }
footer{
    clear: both;
    text-align: center;
    color: white;
}
p:hover , footer:hover{
    color: teal;
    background: white;
}
.card-text {
    color: teal;
}
.card-title {
    color: tomato;
}

.container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    position: relative;
}