body { 
    background: #dddddd; 
    color: #2f2f2f;
    font-family: arial;
    font-size: 16px;
    line-height: normal;
    padding: 30px 0;
}

a { 
    transition: all 200ms linear; 
}

.a-link {
    color: #ff0000;
    cursor: pointer;
    display: inline-block;
    position: relative;
    text-decoration: none;
}

.a-link:after {
    content: "";
    background: #ff0000;
    height: 1px;
    bottom: 1px;
    left: 0;
    position: absolute;
    right: 0;
    transition: all .2s linear;
}
.a-link:focus:after, .a-link:hover:after {
    color: #ff0000;
    left: 50%;
    right: 50%;
}
.a-link:focus, .a-link:hover {
    color: #ff0000;
    text-decoration: none;
}

.container {
    max-width: 750px;
}

.img-fluid {
    display: block;
    margin: 0 auto;
}
input, 
button {
    outline: 0;
}
.inline-block {
    display: inline-block;
}

hr {
    border-top: 1px solid rgba(47, 47, 47, 0);
    box-shadow: 0 2px 3px rgba(0,0,0,0.4);
}

h1, .h1 {
    font-size: 48px;
    color: #cc0000;
}

.font-23 {
    font-size: 23px;
}

.font-28 {
    font-size: 28px;
}

.img-full {
    max-width: 100%;
    width: 100%;
}

.img-600 {
    max-width: 600px;
    width: 100%;
}

.main {
    background: #ffffff;
    box-shadow: 0 2px 5px 2px rgba(0,0,0,0.4);
    border-radius: 10px;
    display: block;
    padding: 30px;
}



/* media query */
@media (max-width: 991.98px) {

}

@media (max-width: 767.98px) {
    body { 
        font-size: 15px;
        padding: 15px 0;
    }
    h1, .h1 {
        font-size: 36px;
    }
    
    .font-23 {
        font-size: 18px;
    }
    
    .font-28 {
        font-size: 22px;
    }

}

@media (max-width: 575.98px) {
    body { 
        font-size: 14px;
    }
    h1, .h1 {
        font-size: 24px;
    }
    
    .font-23 {
        font-size: 14px;
    }
    
    .font-28 {
        font-size: 16px;
    }
    .main {
        padding: 15px;
    }
}