/* reset rule */
*{
    margin: 0; padding: 0; border: 0; box-sizing: border-box;
}
body {
    background-color: purple;
}
h1  {
    text-align: center;
    color: white;
    border: 4px dashed black;
    margin: 18px;
    padding: 8px;
    background-image: repeating-linear-gradient(120deg, red, red 40px, blue 41px, blue 80px, red 81px);
    position: relative;
}
h1 span {
    position: absolute; bottom: -35px; right: 10px;
}
#div1, #div2 {
    width: 600px; height: 100px;
    border: 15px solid Black;
    margin: 50px auto;
}
#div2{
    width: 200px; height: 200px;
    border: 8px dashed burlywood;
    transform: rotate(45deg);
    /* border-radius: 50% makes round */
}
.but1 {
    padding: 8px 16px;
    background: red; color: white;
    border: 2px burlywood;
    margin: 8px;
}
.but2 {
    display: block;
    width: 100px; height: 100px;
    border-radius: 50%;
    margin: 10px auto;
    background-color: red;
    text-align: center;
    line-height: 100px;
}
dt {
    font-weight: bold;
    margin-left: 150px;
    font-size: 120%;
    margin-top: 20px;   
}
dd {
    margin-left: 40px;
    font-style: italic;
}
ul {
    margin-left: 60px;
}