body {
    font-family: 'Georgia';
    background-color: #f4f7f6;
    color: #333;
    line-height: 1.6;
    padding: 40px;
    max-width: 800px;
    margin: auto;
}

h1 {
    color: yellow;
    border-bottom: 3px solid #3498db;
    padding-bottom: 10px;
}

h2 {
    color: orange; 
    margin-top: 0;
}

h4 {
    color: #7f8c8d;
    text-transform: uppercase;
    letter-spacing: 1px;
}

span {
    background-color: #3498db;
    color: white;
    padding: 5px 12px;
    font-weight: bold;
    font-size: 0.9rem;
    margin-right: 5px;
}

form {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin: 20px 0;
}

input {
    display: block;
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}

ul {
    list-style: none;
    padding: 0;
}

li {
    background: #fff;
    margin-bottom: 5px;
    padding: 10px 15px;
    border-left: 5px solid green;
    transition: transform 0.2s;
}

li:nth-child(1) {
    text-align: start;
}

li:nth-child(2) {
    text-align: center;
}

li:nth-child(3) {
    text-align: end;
}

.container-escalier {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    height: 350px;
    margin-top: 30px;
}

.div1, .div2, .div3 {
    width: 100px;
    height: 100px;
    border-radius: 50%;
}

.div1 {
    background-color: blue;
    align-self: flex-start;
    justify-content: center;
}


.div2 {
    background-color: red;
    align-self: center;
}

.div3 {
    background-color: green;
    align-self: flex-end;
}

.circleb {
    width: 100px;
    height: 100px;
    background-color: blue;
    border-radius: 50%;
}

.divspacebetween, .divcenter, .divspacearound, .divspaceevenly {
    display: flex;
    margin: 40px 0;
    padding: 10px;
}


.divspacebetween {
   justify-content: space-between;
   gap: 10px;


}

.divcenter {
    justify-content: center;
    gap: 10px;
}

.divspacearound {
    justify-content: space-around;
}

.divspaceevenly {
    justify-content: space-evenly;
}