*{
    box-sizing: border-box;
}


:root{
    --line-border-fill:#3498bd;
    --line-border-empty:#e0e0e0;
}

body{
    background-color:rgb(58, 54, 54);
    font-family: 'Courier New', Courier, monospace;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    margin: 0;
    align-items: center;
    justify-content:center;
}

.heading{
    font-size:50px;
    font-weight: 600;
    letter-spacing:2px;
    color: #ffff;
    
}



.container{
    text-align: center;
    margin:4rem;
}

.progress-container{
    display:flex;
    justify-content: space-between;
    position: relative;
    margin-bottom: 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;
}

.progress{
    background-color: var(--line-border-fill);
    position:absolute;
    top:50%;
    left:0;
    transform: translateY(-50%);
    height:4px;
    width:0%;
    z-index:-1;
    transition: 0.4s ease;
}


.circle{
    background-color: #ffff;
    color: #999;
    border-radius:50%;
    height:30px;
    width:30px;
    display:flex;
    align-items:center;
    justify-content:center;
    border: 3px solid #e0e0e0;
    transition: .4 ease;
}

.circle.active{
    border-color: var(--line-border-fill);
}



.btn{
    background-color: var(--line-border-fill);
    color:#c9baba;
    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;
}