body,html,input,button {
    margin: 0;
    padding: 0;
    font-size: 16px;
}

.logo {
    width: 100%;
    height: auto;
}

.content-1 {
    margin: 20px 20px 0 20px;
    padding: 20px;
    height: 100%;
    position: relative;
    overflow: hidden;
    border-radius: 15px;
    border: 5px solid black;
}

.content-2 {
    display: none;
    margin: 20px 20px 0 20px;
    padding: 20px;
    height: 100%;
    position: relative;
    overflow: hidden;
    border-radius: 15px;
    border: 5px solid black;
}

h2 {
    margin: 0;
    padding: 0;
    font-size: 23px;
}

span {
    color:red;
}

input {
    margin: 20px 20px 0 20px;
    padding: 20px;
    width: calc(100% - 40px);
    box-sizing: border-box;
    border-radius: 15px;
    border: 2px solid black;
    box-sizing: border-box;
}

button {
    margin: 20px 20px 0 20px;
    padding: 10px;
    width: calc(100% - 40px);
    box-sizing: border-box;
    border-radius: 15px;
    border: none;
    background-color: #00A2E8;
    color: white;
    cursor: pointer;
    border: 2px solid black;
    font-size: 26px;
}

.add-line {
    display: none;
}

.errorbox {
    display: none;
    margin: 20px 20px 0 20px;
    padding: 20px;
    border-radius: 15px;
    border: 1px solid #ff5252;
    background-color: #f8d7da;
    color: #721c24;
    background-color: #ffebee;
}

.loading {
    display: none;
    text-align: center;
    padding: 20px;
}

.loading-text {
    color: #2196F3;
    font-size: 18px;
    margin-bottom: 10px;
}

.progress {
    width: 80%;
    height: 20px;
    background-color: #e0e0e0;
    border-radius: 10px;
    margin: 0 auto;
    overflow: hidden;
}

.progress-bar {
    width: 0%;
    height: 100%;
    background-color: #2196F3;
    transition: width 1.5s linear;
}