#btn {
    /* border-top-left-radius: 20px;
    border-top-right-radius: 20px;
    border-bottom-left-radius: 20px; */
    /* background-color: black; */
    color: aliceblue;
    width: 150px;
    height: 40px;
    font-weight: bold;
    border: none;
}
#a3:hover{
    font-weight: bold;
    border-bottom: 2px solid black;
    color: black;
}
input{
    width: 600px;
    height: 50px;
    margin-top: 10px;
}
#comment{
    height: 300px;
}
#btn1{
  background-color:   #ffc20a; 
  width: 600px;
  height: 50px;
}

#box4{
    display: flex;
    justify-content: space-evenly;
}
.exo{
    display: flex;
    height: 400px;
    background-color: black;
    /* margin-top: 10px; */
    justify-content: space-around;
}
a{
    text-decoration: none;
    color: white;
    /* font-weight: bold; */
    font-size: 15px;
    font-weight: bold;
}