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

.stu-1 {
    width: 100%;
    margin: 0 auto 2em auto;

}

.stu-1-1 {
    width: 100%;
    text-align: center;
    background-color: green;
    padding: 2.6em ;
    margin: 0;
    color:  white;
}

.stu-2 {
    width: 80%;
    margin: auto;
    background-color: rgb(250, 255, 251);
    border-radius: 5px;
    padding-top: 2em;
    -webkit-box-shadow: 0px 0px 5px 0px rgba(0,0,0,0.44);
    -moz-box-shadow: 0px 0px 5px 0px rgba(0,0,0,0.44);
    box-shadow: 0px 0px 5px 0px rgba(0,0,0,0.44);
}
.stu-2-1 {
    text-align: center;
    margin-bottom: 1.5em;
}
.stu-2-2 {
    width: 90%;
    margin: 1em auto 2em auto;
    padding: 1em;
    background-color: rgb(236, 255, 234);
    border-radius: 10px;
    -webkit-box-shadow: 0px 0px 5px 0px rgba(0,0,0,0.3);
    -moz-box-shadow: 0px 0px 5px 0px rgba(0,0,0,0.3);
    box-shadow: 0px 0px 5px 0px rgba(0,0,0,0.3);
}
.stu-2-2 p {
    margin: 1em;
    line-height: 1.5em;
}

.stu-2-3 {
    width: 90%;
    margin: 1em auto 1em auto;
    padding: 2em;
    background-color: rgb(236, 255, 234);
    border-radius: 10px;
    -webkit-box-shadow: 0px 0px 5px 0px rgba(0,0,0,0.3);
    -moz-box-shadow: 0px 0px 5px 0px rgba(0,0,0,0.3);
    box-shadow: 0px 0px 5px 0px rgba(0,0,0,0.3);
}
.stu-2-3 li {
    margin: 0.6em;
}

.stu-2-4 {
    width: 95%;
    margin: 1em auto 2em auto;
    padding: 2em ;
    text-align: center;

}