.header{
    display: flex;
    height: 50px;
    width: 100%;
    border: 1px solid transparent;
    justify-content: center;
    font-size: larger;
    position: relative;
    top: -1px;
}
.mit-logo{
    position: relative;
    top:6px;


}
header input{
    text-decoration: none;
    border: transparent;
    }
.images
{
    position:relative;
    
}
 a{
    text-decoration: none;
    color: black;
}
a:hover{
    color: blue;
}

.trois{
    border: 1px black solid;
    height: 500px;
    width: 50%;
}
.bloc2 p{
    background-color: #1d4e39;
    width: 100%;
    height: 250px;
    border: 1px transparent solid;
    font-size: 40px;
    position:relative ;
    top: -50px;
    color:white
}
.bloc3 {
    width: 100%;
    height: 100px;
    border: 1px solid black;
    text-align: center;
    position: relative;
    top: -90px;
    font-size: 30px;
}
.mere a{
    height: 90px;
    width: 100%;
    border: 1px solid;
    justify-content: end;
    margin-right: 50px;
    font-size: 2.5em;
    border: none;   
}
.mere a:hover{
    border-bottom: #1d4e39 5px solid;
}
.bloc4{
    grid-template-columns: 1fr 1fr;
    display: flex;
    position: relative;
    bottom: 90px;
    justify-content: space-between;
}
.bloc5{
    grid-template-columns: 1fr 1fr;
    display: flex;
    font: 6em ; 
    position: relative;
    top: -80px;
    height: 200px;
    border: 1px transparent solid;
}
.bloc8{
    display: flex;
    grid-template-columns: 1fr 1fr;
    position: relative;
    top: -80px;
    margin-left: 29px;
    justify-content: space-between;

}
.bloc11{
    display: flex;
    grid-template-columns: 1fr 1fr;
    position: absolute;
}
.bloc14{
    display: flex;
    grid-template-columns: 1fr 1fr;
    position: relative;
    margin-top: 120px;
    justify-content: space-between;
}
.bloc17{
    display: flex;
    grid-template-columns: 1fr 1fr;
    position: relative;
    margin-bottom: 150px;
}
.bloc19{
    width: 100%;
    height: 100px;
    background-color: #1d4e39;
    color: white;
    position: relative;
    font-size: 16.0002px;
    font-family: sans-serif;
   
}
.bloc20 p{
    border-bottom: 1px #1d4e39 solid;
    font-size: 1.5em;
    
    display: grid;
}