*{
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}
:root{
    --line--border--fill:#3498db;
    --line--border--empty:#e0e0e0;
}
body{
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
.container{
    text-align: center;
}
.progress-container{
    display: flex;
    justify-content: space-between;
    position: relative;
    margin-block-end:30px ;
    max-width: 100%;
    width: 350px;
}
.progress-container::before{
    content: '';
    background-color: var(--line--border--empty);
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 4px;
    width: 100%;
    z-index: -1;   
    outline: 0;   
}
.progress{
    background-color: var(--line--border--fill);
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 4px;
    width: 0%;
    border: 0;
    padding: 0;
    margin: 0;
    z-index: -1;
    transition: 0.4s ease;
}
.circle{
    background-color:#fff;
    color: #999;
    border: 3px solid var(--line--border--empty);
    border-radius: 50%;
    height: 30px;
    width: 30px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}
.circle.active{
    border-color: var(--line--border--fill);
}
.btn{
    background-color: var(--line--border--fill);
    color: #fff;
    border: 0;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    padding: 8px 30px;
    margin: 5px;
    font-size:14px;
}
.btn:active{
    transform: scale(0.98);
}
.btn:focus{
    outline: 0;
}
.btn:disabled{
    background-color: var(--line--border--empty);
    cursor: not-allowed;
}