#caja1 {
    border-top: 5px;
    border-top-color: green;
    border-top-style: dotted;
    border-bottom: 5px;
    border-bottom-color: red;
    border-bottom-style: dotted;
    border-left: 5px;
    border-left-color: blue;
    border-left-style: dashed;
    border-right: 5px;
    border-right-color: orange;
    border-right-style: dashed;
    margin-top: 15px;
    margin-bottom: 15px;
    text-align: center;
    padding: 15px;
}
#caja2 {
    border-top: 5px;
    border-top-color: aqua;
    border-top-style: solid;
    border-bottom: 5px;
    border-bottom-color: pink;
    border-bottom-style: solid;
    border-left: 10px;
    border-left-color: black;
    border-left-style: solid;
    border-right: 10px;
    border-right-color: black;
    border-right-style: solid;
    text-align: right;
}
#caja3 {
    border: 2px; border-style: solid; border-color: black; padding: 10px;
}
.divletras {
    height: 120px;
    width: 120px;
    margin-left: 50px;
    margin-bottom: 20px;
    margin-top: 20px;
    float: left;
    text-align: center;
    padding: 20px;
    background-color: #F2F1EE;
    border: 1px;
    border-color: black;
    border-style: solid;
}
#A {
    border-radius: 24px;
}
#B {
    border-top-left-radius: 24px;
}
#C {
    border-top-left-radius: 24px;
    border-bottom-right-radius: 24px;
}
#D {
    border-top-left-radius: 36px;
    border-bottom-right-radius: 36px;
    border-top-right-radius: 12px;
    border-bottom-left-radius: 12px;
}
#E {
    border-top-right-radius: 50px;
    border-top-right-radius: 30px;
}
#F {
    border-bottom-right-radius: 50px;
    border-bottom-right-radius: 30px;
}
#G {
    border-radius: 50%;
}
#H {
    border-top-right-radius: 50%;
    border-top-left-radius: 50%;
}
#I {
    border-top-right-radius: 24px;
    border-bottom-right-radius: 24px;
}
#J {
    border-top-left-radius: 24px;
    border-bottom-left-radius: 24px;
}
#K {
    border-top-right-radius: 50%;
    border-bottom-left-radius: 50%;
}
#L {
    border-radius: 50% / 20%;
}